diff --git a/src/ecmascript/quickjs/document.c b/src/ecmascript/quickjs/document.c
index 5a0a6a20..881bdd0e 100644
--- a/src/ecmascript/quickjs/document.c
+++ b/src/ecmascript/quickjs/document.c
@@ -902,7 +902,9 @@ js_document_write_do(JSContext *ctx, JSValueConst this_val, int argc, JSValueCon
 	struct string *ret = interpreter->ret;
 	struct string code;
 
-	init_string(&code);
+	if (!init_string(&code)) {
+		return JS_EXCEPTION;
+	}
 
 	if (argc >= 1)
 	{
@@ -1004,8 +1006,13 @@ js_document_replace(JSContext *ctx, JSValueConst this_val, int argc, JSValueCons
 	struct string needle;
 	struct string heystack;
 
-	init_string(&needle);
-	init_string(&heystack);
+	if (!init_string(&needle)) {
+		return JS_EXCEPTION;
+	}
+	if (!init_string(&heystack)) {
+		done_string(&needle);
+		return JS_EXCEPTION;
+	}
 
 	const char *str;
 	size_t len;
@@ -1036,23 +1043,27 @@ js_document_replace(JSContext *ctx, JSValueConst this_val, int argc, JSValueCons
 		fd_len=f->length;
 
 		struct string f_data;
-		init_string(&f_data);
-		add_to_string(&f_data,f->data);
+		if (init_string(&f_data)) {
+			add_to_string(&f_data,f->data);
 
-		struct string nu_str;
-		init_string(&nu_str);
-		string_replace(&nu_str,&f_data,&needle,&heystack);
-		nu_len=nu_str.length;
-		delete_entry_content(cached);
-		/* This is very ugly, indeed. And Yes fd_len isn't 
-		 * logically correct. But using nu_len will cause
-		 * the document to render improperly.
-		 * TBD: somehow better rerender the document 
-		 * now it's places on the session level in doc_loading_callback */
-		int ret = add_fragment(cached,0,nu_str.source,fd_len);
-		normalize_cache_entry(cached,nu_len);
-		document->ecmascript_counter++;
-		//DBG("doc replace %s %s\n", needle.source, heystack.source);
+			struct string nu_str;
+			if (init_string(&nu_str)) {
+				string_replace(&nu_str,&f_data,&needle,&heystack);
+				nu_len=nu_str.length;
+				delete_entry_content(cached);
+				/* This is very ugly, indeed. And Yes fd_len isn't 
+				 * logically correct. But using nu_len will cause
+				 * the document to render improperly.
+				 * TBD: somehow better rerender the document 
+				 * now it's places on the session level in doc_loading_callback */
+				int ret = add_fragment(cached,0,nu_str.source,fd_len);
+				normalize_cache_entry(cached,nu_len);
+				document->ecmascript_counter++;
+				done_string(&nu_str);
+			}
+			//DBG("doc replace %s %s\n", needle.source, heystack.source);
+			done_string(&f_data);
+		}
 	}
 
 	done_string(&needle);
diff --git a/src/ecmascript/quickjs/element.c b/src/ecmascript/quickjs/element.c
index f5fef4b4..04d9d63a 100644
--- a/src/ecmascript/quickjs/element.c
+++ b/src/ecmascript/quickjs/element.c
@@ -734,7 +734,9 @@ js_element_get_property_innerHtml(JSContext *ctx, JSValueConst this_val)
 		return JS_NULL;
 	}
 	struct string buf;
-	init_string(&buf);
+	if (!init_string(&buf)) {
+		return JS_EXCEPTION;
+	}
 	walk_tree(&buf, el);
 	JSValue ret = JS_NewStringLen(ctx, buf.source, buf.length);
 	done_string(&buf);
@@ -754,7 +756,9 @@ js_element_get_property_outerHtml(JSContext *ctx, JSValueConst this_val)
 		return JS_NULL;
 	}
 	struct string buf;
-	init_string(&buf);
+	if (!init_string(&buf)) {
+		return JS_EXCEPTION;
+	}
 	walk_tree(&buf, el, false);
 	JSValue ret = JS_NewStringLen(ctx, buf.source, buf.length);
 	done_string(&buf);
@@ -774,7 +778,9 @@ js_element_get_property_textContent(JSContext *ctx, JSValueConst this_val)
 		return JS_NULL;
 	}
 	struct string buf;
-	init_string(&buf);
+	if (!init_string(&buf)) {
+		return JS_EXCEPTION;
+	}
 	walk_tree_content(&buf, el);
 	JSValue ret = JS_NewStringLen(ctx, buf.source, buf.length);
 	done_string(&buf);
@@ -1422,8 +1428,13 @@ js_element_isEqualNode(JSContext *ctx, JSValueConst this_val, int argc, JSValueC
 	struct string first;
 	struct string second;
 
-	init_string(&first);
-	init_string(&second);
+	if (!init_string(&first)) {
+		return JS_EXCEPTION;
+	}
+	if (!init_string(&second)) {
+		done_string(&first);
+		return JS_EXCEPTION;
+	}
 
 	walk_tree(&first, el, false, true);
 	walk_tree(&second, el2, false, true);
diff --git a/src/ecmascript/quickjs/location.c b/src/ecmascript/quickjs/location.c
index e7681487..3dc48aac 100644
--- a/src/ecmascript/quickjs/location.c
+++ b/src/ecmascript/quickjs/location.c
@@ -64,7 +64,9 @@ js_location_get_property_hash(JSContext *ctx, JSValueConst this_val)
 	}
 
 	struct string fragment;
-	init_string(&fragment);
+	if (!init_string(&fragment)) {
+		return JS_EXCEPTION;
+	}
 
 	if (vs->uri->fragmentlen) {
 		add_bytes_to_string(&fragment, vs->uri->fragment, vs->uri->fragmentlen);
@@ -217,7 +219,9 @@ js_location_get_property_pathname(JSContext *ctx, JSValueConst this_val)
 	}
 
 	struct string pathname;
-	init_string(&pathname);
+	if (!init_string(&pathname)) {
+		return JS_EXCEPTION;
+	}
 
 	const char *query = memchr(vs->uri->data, '?', vs->uri->datalen);
 	int len = (query ? query - vs->uri->data : vs->uri->datalen);
@@ -247,7 +251,9 @@ js_location_get_property_port(JSContext *ctx, JSValueConst this_val)
 	}
 
 	struct string port;
-	init_string(&port);
+	if (!init_string(&port)) {
+		return JS_EXCEPTION;
+	}
 	if (vs->uri->portlen) {
 		add_bytes_to_string(&port, vs->uri->port, vs->uri->portlen);
 	}
@@ -275,7 +281,9 @@ js_location_get_property_protocol(JSContext *ctx, JSValueConst this_val)
 	}
 
 	struct string proto;
-	init_string(&proto);
+	if (!init_string(&proto)) {
+		return JS_EXCEPTION;
+	}
 
 	/* Custom or unknown keep the URI untouched. */
 	if (vs->uri->protocol == PROTOCOL_UNKNOWN) {
@@ -308,7 +316,9 @@ js_location_get_property_search(JSContext *ctx, JSValueConst this_val)
 	}
 
 	struct string search;
-	init_string(&search);
+	if (!init_string(&search)) {
+		return JS_EXCEPTION;
+	}
 
 	const char *query = memchr(vs->uri->data, '?', vs->uri->datalen);