diff --git a/Zend/zend_builtin_functions.c b/Zend/zend_builtin_functions.c
index 33dfea0..057fe96 100644
--- a/Zend/zend_builtin_functions.c
+++ b/Zend/zend_builtin_functions.c
@@ -1636,7 +1636,9 @@ ZEND_FUNCTION(set_error_handler)
 			zend_string *error_handler_name = zend_get_callable_name(error_handler);
 			zend_error(E_WARNING, "%s() expects the argument (%s) to be a valid callback",
 					   get_active_function_name(), error_handler_name?ZSTR_VAL(error_handler_name):"unknown");
-			zend_string_release_ex(error_handler_name, 0);
+			if (error_handler_name) {
+				zend_string_release_ex(error_handler_name, 0);
+			}
 			return;
 		}
 	}
@@ -1703,7 +1705,9 @@ ZEND_FUNCTION(set_exception_handler)
 		zend_string *exception_handler_name = zend_get_callable_name(exception_handler);
 			zend_error(E_WARNING, "%s() expects the argument (%s) to be a valid callback",
 					   get_active_function_name(), exception_handler_name?ZSTR_VAL(exception_handler_name):"unknown");
-			zend_string_release_ex(exception_handler_name, 0);
+			if (exception_handler_name) {
+				zend_string_release_ex(exception_handler_name, 0);
+			}
 			return;
 		}
 	}
diff --git a/Zend/zend_exceptions.c b/Zend/zend_exceptions.c
index 2d52e4e..a1c1022 100644
--- a/Zend/zend_exceptions.c
+++ b/Zend/zend_exceptions.c
@@ -1040,8 +1040,12 @@ ZEND_API ZEND_COLD void zend_exception_error(zend_object *ex, int severity) /* {
 		zend_error_va(severity, (file && ZSTR_LEN(file) > 0) ? ZSTR_VAL(file) : NULL, line,
 			"Uncaught %s\n  thrown", ZSTR_VAL(str));
 
-		zend_string_release_ex(str, 0);
-		zend_string_release_ex(file, 0);
+		if (str) {
+			zend_string_release_ex(str, 0);
+		}
+		if (file) {
+			zend_string_release_ex(file, 0);
+		}
 	} else {
 		zend_error(severity, "Uncaught exception '%s'", ZSTR_VAL(ce_exception->name));
 	}
diff --git a/Zend/zend_multibyte.c b/Zend/zend_multibyte.c
index 956ffbb..0c7c65e 100644
--- a/Zend/zend_multibyte.c
+++ b/Zend/zend_multibyte.c
@@ -115,6 +115,9 @@ ZEND_API int zend_multibyte_set_functions(const zend_multibyte_functions *functi
 	 */
 	{
 		const char *value = zend_ini_string("zend.script_encoding", sizeof("zend.script_encoding") - 1, 0);
+		if (!value) {
+			return FAILURE;
+		}
 		zend_multibyte_set_script_encoding_by_string(value, strlen(value));
 	}
 	return SUCCESS;
diff --git a/ext/dom/entity.c b/ext/dom/entity.c
index b412550..34b83ee 100644
--- a/ext/dom/entity.c
+++ b/ext/dom/entity.c
@@ -106,6 +106,9 @@ int dom_entity_notation_name_read(dom_object *obj, zval *retval)
 		ZVAL_NULL(retval);
 	} else {
 		content = (char *) xmlNodeGetContent((xmlNodePtr) nodep);
+		if (!content) {
+			return FAILURE;
+		}
 		ZVAL_STRING(retval, content);
 		xmlFree(content);
 	}
diff --git a/ext/phar/phar.c b/ext/phar/phar.c
index ecab916..06bb697 100644
--- a/ext/phar/phar.c
+++ b/ext/phar/phar.c
@@ -2751,8 +2751,10 @@ int phar_flush(phar_archive_data *phar, char *user_stub, zend_long len, int conv
 			newentry = phar_open_jit(phar, entry, error);
 			if (!newentry) {
 				/* major problem re-opening, so we ignore this file and the error */
-				efree(*error);
-				*error = NULL;
+				if (error) {
+					efree(*error);
+					*error = NULL;
+				}
 				continue;
 			}
 			entry = newentry;
diff --git a/ext/phar/tar.c b/ext/phar/tar.c
index 03e6dd4..52b5c5d 100644
--- a/ext/phar/tar.c
+++ b/ext/phar/tar.c
@@ -899,7 +899,7 @@ int phar_tar_setmetadata(zval *metadata, phar_entry_info *entry, char **error) /
 		spprintf(error, 0, "phar error: unable to create temporary file");
 		return -1;
 	}
-	if (ZSTR_LEN(entry->metadata_str.s) != php_stream_write(entry->fp, ZSTR_VAL(entry->metadata_str.s), ZSTR_LEN(entry->metadata_str.s))) {
+	if (entry->metadata_str.s && ZSTR_LEN(entry->metadata_str.s) != php_stream_write(entry->fp, ZSTR_VAL(entry->metadata_str.s), ZSTR_LEN(entry->metadata_str.s))) {
 		spprintf(error, 0, "phar tar error: unable to write metadata to magic metadata file \"%s\"", entry->filename);
 		zend_hash_str_del(&(entry->phar->manifest), entry->filename, entry->filename_len);
 		return ZEND_HASH_APPLY_STOP;
diff --git a/ext/sqlite3/sqlite3.c b/ext/sqlite3/sqlite3.c
index f4d8066..9386c05 100644
--- a/ext/sqlite3/sqlite3.c
+++ b/ext/sqlite3/sqlite3.c
@@ -877,7 +877,9 @@ static int sqlite3_do_callback(struct php_sqlite3_fci *fc, zval *cb, int argc, s
 		if (agg_context && !Z_ISUNDEF(agg_context->zval_context)) {
 			zval_ptr_dtor(&agg_context->zval_context);
 		}
-		ZVAL_COPY_VALUE(&agg_context->zval_context, &retval);
+		if (agg_context) {
+			ZVAL_COPY_VALUE(&agg_context->zval_context, &retval);
+		}
 		ZVAL_UNDEF(&retval);
 	}

diff --git a/ext/standard/filters.c b/ext/standard/filters.c
index 018270c..6acce21 100644
--- a/ext/standard/filters.c
+++ b/ext/standard/filters.c
@@ -766,7 +766,7 @@ static void php_conv_qprint_encode_dtor(php_conv_qprint_encode *inst)
 }
 
 #define NEXT_CHAR(ps, icnt, lb_ptr, lb_cnt, lbchars) \
-	((lb_ptr) < (lb_cnt) ? (lbchars)[(lb_ptr)] : *(ps))
+	((lb_ptr) < (lb_cnt) && (lbchars) ? (lbchars)[(lb_ptr)] : ((ps) ? *(ps) : '\0'))
 
 #define CONSUME_CHAR(ps, icnt, lb_ptr, lb_cnt) \
 	if ((lb_ptr) < (lb_cnt)) { \
diff --git a/ext/standard/var.c b/ext/standard/var.c
index 37a68bb..ba68cf3 100644
--- a/ext/standard/var.c
+++ b/ext/standard/var.c
@@ -1070,8 +1070,10 @@ again:
 						/* Mark this value in the var_hash, to avoid creating references to it. */
 						zval *var_idx = zend_hash_index_find(&var_hash->ht,
 							(zend_ulong) (zend_uintptr_t) Z_COUNTED_P(struc));
-						ZVAL_LONG(var_idx, -1);
-						smart_str_appendl(buf, "N;", 2);
+						if (var_idx) {
+							ZVAL_LONG(var_idx, -1);
+							smart_str_appendl(buf, "N;", 2);
+						}
 					}
 					if (serialized_data) {
 						efree(serialized_data);
diff --git a/sapi/fpm/fpm/fpm_conf.c b/sapi/fpm/fpm/fpm_conf.c
index 7a05286..378c585 100644
--- a/sapi/fpm/fpm/fpm_conf.c
+++ b/sapi/fpm/fpm/fpm_conf.c
@@ -720,8 +720,8 @@ static int fpm_evaluate_full_path(char **path, struct fpm_worker_pool_s *wp, cha
 			}
 
 			if (strlen(*path) > strlen("$prefix")) {
-				free(*path);
 				tmp = strdup((*path) + strlen("$prefix"));
+				free(*path);
 				*path = tmp;
 			} else {
 				free(*path);
diff --git a/sapi/fpm/fpm/zlog.c b/sapi/fpm/fpm/zlog.c
index 4808447..849370c 100644
--- a/sapi/fpm/fpm/zlog.c
+++ b/sapi/fpm/fpm/zlog.c
@@ -348,7 +348,7 @@ static ssize_t zlog_stream_direct_write(
 static inline ssize_t zlog_stream_unbuffered_write(
 		struct zlog_stream *stream, const char *buf, size_t len) /* {{{ */
 {
-	const char *append;
+	const char *append = NULL;
 	size_t append_len = 0, required_len, reserved_len;
 	ssize_t written;
 
@@ -637,10 +637,10 @@ zlog_bool zlog_stream_set_msg_suffix(
 	if (suffix != NULL) {
 		stream->msg_suffix_len = strlen(suffix);
 		len = stream->msg_suffix_len + 1;
-		stream->msg_suffix = malloc(len);
 		if (stream->msg_suffix != NULL) {
 			free(stream->msg_suffix);
 		}
+		stream->msg_suffix = malloc(len);
 		if (stream->msg_suffix == NULL) {
 			return ZLOG_FALSE;
 		}
@@ -652,7 +652,7 @@ zlog_bool zlog_stream_set_msg_suffix(
 		len = stream->msg_final_suffix_len + 1;
 		stream->msg_final_suffix = malloc(len);
 		if (stream->msg_final_suffix != NULL) {
-			free(stream->msg_suffix);
+			free(stream->msg_final_suffix);
 		}
 		if (stream->msg_final_suffix == NULL) {
 			return ZLOG_FALSE;
diff --git a/sapi/phpdbg/phpdbg_prompt.c b/sapi/phpdbg/phpdbg_prompt.c
index 6b0de5c..0764789 100644
--- a/sapi/phpdbg/phpdbg_prompt.c
+++ b/sapi/phpdbg/phpdbg_prompt.c
@@ -544,6 +544,9 @@ int phpdbg_compile_stdin(zend_string *code) {
 		/* remove trailing data after zero byte, used for avoiding conflicts in eval()'ed code snippets */
 		zend_string *source_path = strpprintf(0, "Standard input code%c%p", 0, PHPDBG_G(ops)->opcodes);
 		phpdbg_file_source *data = zend_hash_find_ptr(&PHPDBG_G(file_sources), source_path);
+		if (!data) {
+			return FAILURE;
+		}
 		dtor_func_t dtor = PHPDBG_G(file_sources).pDestructor;
 		PHPDBG_G(file_sources).pDestructor = NULL;
 		zend_hash_del(&PHPDBG_G(file_sources), source_path);
@@ -1349,7 +1352,7 @@ PHPDBG_API const char *phpdbg_load_module_or_extension(char **path, char **name)
 		module_entry->handle = handle;
 
 		if ((module_entry = zend_register_module_ex(module_entry)) == NULL) {
-			phpdbg_error("dl", "type=\"registerfailure\" module=\"%s\"", "Unable to register module %s", module_entry->name);
+			phpdbg_error("dl", "type=\"registerfailure\" module=\"%s\"", "Unable to register module %s", "Unknown module");
 
 			goto quit;
 		}
diff --git a/main/streams/plain_wrapper.c b/main/streams/plain_wrapper.c
index 4d10e68..1acfec6 100644
--- a/main/streams/plain_wrapper.c
+++ b/main/streams/plain_wrapper.c
@@ -926,6 +926,7 @@ static int php_stdiop_set_option(php_stream *stream, int option, int value, void
 				}
 			}
 
+			return PHP_STREAM_OPTION_RETURN_NOTIMPL;
 #ifdef PHP_WIN32
 		case PHP_STREAM_OPTION_PIPE_BLOCKING:
 			data->is_pipe_blocking = value;
diff --git a/ext/phar/phar_object.c b/ext/phar/phar_object.c
index b0de6e4..5e3adec 100644
--- a/ext/phar/phar_object.c
+++ b/ext/phar/phar_object.c
@@ -2654,16 +2654,14 @@
 		zend_throw_exception_ex(phar_ce_PharException, 0, "phar \"%s\" is persistent, unable to copy on write", phar_obj->archive->fname);
 		return;
 	}
-	if (zend_hash_str_exists(&phar_obj->archive->manifest, fname, (uint32_t) fname_len)) {
-		if (NULL != (entry = zend_hash_str_find_ptr(&phar_obj->archive->manifest, fname, (uint32_t) fname_len))) {
-			if (entry->is_deleted) {
-				/* entry is deleted, but has not been flushed to disk yet */
-				RETURN_TRUE;
-			} else {
-				entry->is_deleted = 1;
-				entry->is_modified = 1;
-				phar_obj->archive->is_modified = 1;
-			}
+	if (NULL != (entry = zend_hash_str_find_ptr(&phar_obj->archive->manifest, fname, (uint32_t) fname_len))) {
+		if (entry->is_deleted) {
+			/* entry is deleted, but has not been flushed to disk yet */
+			RETURN_TRUE;
+		} else {
+			entry->is_deleted = 1;
+			entry->is_modified = 1;
+			phar_obj->archive->is_modified = 1;
 		}
 	} else {
 		zend_throw_exception_ex(spl_ce_BadMethodCallException, 0, "Entry %s does not exist and cannot be deleted", fname);
@@ -3478,18 +3476,16 @@
 		RETURN_FALSE;
 	}
 
-	if (!zend_hash_str_exists(&phar_obj->archive->manifest, oldfile, (uint32_t) oldfile_len) || NULL == (oldentry = zend_hash_str_find_ptr(&phar_obj->archive->manifest, oldfile, (uint32_t) oldfile_len)) || oldentry->is_deleted) {
+	if (NULL == (oldentry = zend_hash_str_find_ptr(&phar_obj->archive->manifest, oldfile, (uint32_t) oldfile_len)) || oldentry->is_deleted) {
 		zend_throw_exception_ex(spl_ce_UnexpectedValueException, 0,
 			"file \"%s\" cannot be copied to file \"%s\", file does not exist in %s", oldfile, newfile, phar_obj->archive->fname);
 		RETURN_FALSE;
 	}
 
-	if (zend_hash_str_exists(&phar_obj->archive->manifest, newfile, (uint32_t) newfile_len)) {
-		if (NULL != (temp = zend_hash_str_find_ptr(&phar_obj->archive->manifest, newfile, (uint32_t) newfile_len)) || !temp->is_deleted) {
-			zend_throw_exception_ex(spl_ce_UnexpectedValueException, 0,
-				"file \"%s\" cannot be copied to file \"%s\", file must not already exist in phar %s", oldfile, newfile, phar_obj->archive->fname);
-			RETURN_FALSE;
-		}
+	if (NULL != (temp = zend_hash_str_find_ptr(&phar_obj->archive->manifest, newfile, (uint32_t) newfile_len)) && !temp->is_deleted) {
+		zend_throw_exception_ex(spl_ce_UnexpectedValueException, 0,
+			"file \"%s\" cannot be copied to file \"%s\", file must not already exist in phar %s", oldfile, newfile, phar_obj->archive->fname);
+		RETURN_FALSE;
 	}
 
 	tmp_len = newfile_len;
diff --git a/ext/enchant/enchant.c b/ext/enchant/enchant.c
index 6ce9d4b..d8e26f6 100644
--- a/ext/enchant/enchant.c
+++ b/ext/enchant/enchant.c
@@ -269,7 +269,9 @@ static void php_enchant_dict_free(zend_resource *rsrc) /* {{{ */
 				enchant_broker_free_dict(pbroker->pbroker, pdict->pdict);
 			}
 
-			pbroker->dict[pdict->id] = NULL;
+			if (pbroker->dict)
+				pbroker->dict[pdict->id] = NULL;
+
 			efree(pdict);
 			zend_list_delete(pbroker->rsrc);
 		}
diff --git a/ext/mbstring/libmbfl/filters/mbfilter_sjis_2004.c b/ext/mbstring/libmbfl/filters/mbfilter_sjis_2004.c
index ac476b3..9b51dd0 100644
--- a/ext/mbstring/libmbfl/filters/mbfilter_sjis_2004.c
+++ b/ext/mbstring/libmbfl/filters/mbfilter_sjis_2004.c
@@ -682,7 +682,7 @@ mbfl_filt_conv_jis2004_flush(mbfl_convert_filter *filter)
 	k = filter->cache;
 	filter->cache = 0;
 
-	if (filter->status == 1 && k >= 0 && k <= jisx0213_u2_tbl_len) {
+	if (filter->status == 1 && k >= 0 && k < jisx0213_u2_tbl_len) {
 		s1 = jisx0213_u2_fb_tbl[k];
 
 		if (filter->to->no_encoding == mbfl_no_encoding_sjis2004) {
diff --git a/ext/soap/php_encoding.c b/ext/soap/php_encoding.c
index e0cf63d..d30d9e1 100644
--- a/ext/soap/php_encoding.c
+++ b/ext/soap/php_encoding.c
@@ -907,7 +907,7 @@ static xmlNodePtr to_xml_string(encodeTypePtr type, zval *data, int style, xmlNo
 	xmlAddChild(ret, text);
 	efree(str);
 
-	if (style == SOAP_ENCODED) {
+	if (style == SOAP_ENCODED && type) {
 		set_ns_and_type(ret, type);
 	}
 	return ret;
diff --git a/ext/mysqlnd/mysqlnd_result.c b/ext/mysqlnd/mysqlnd_result.c
index 4dcaf12..96e516b 100644
--- a/ext/mysqlnd/mysqlnd_result.c
+++ b/ext/mysqlnd/mysqlnd_result.c
@@ -1396,8 +1396,8 @@ MYSQLND_METHOD(mysqlnd_res, store_result_fetch_data)(MYSQLND_CONN_DATA * const c
 				UPSERT_STATUS_GET_SERVER_STATUS(conn->upsert_status));
 free_end:
 	PACKET_FREE(&row_packet);
+	DBG_INF_FMT("rows=%llu", (unsigned long long)set->row_count);
 end:
-	DBG_INF_FMT("rows=%llu", (unsigned long long)result->stored_data->row_count);
 	DBG_RETURN(ret);
 }
 /* }}} */