diff --git a/src/Errors.h b/src/Errors.h
index 38dd8ee30..551084fab 100644
--- a/src/Errors.h
+++ b/src/Errors.h
@@ -112,6 +112,7 @@ enum CC_ERRORS {
 
 	ERR_DOWNLOAD_INVALID = 0xCCDED05CUL, /* Unspecified error occurred downloading data */
 	ERR_NO_AUDIO_OUTPUT  = 0xCCDED05DUL, /* No audio output devices are connected */
-	ERR_INVALID_URL      = 0xCCDED05EUL  /* Invalid URL provided to download from */
+	ERR_INVALID_DATA_URL = 0xCCDED05EUL, /* Invalid URL provided to download from */
+	ERR_INVALID_OPEN_URL = 0xCCDED05FUL, /* Invalid URL provided to open in new tab */
 };
 #endif
diff --git a/src/Http_Web.c b/src/Http_Web.c
index c1e9b4084..3e51fc2c4 100644
--- a/src/Http_Web.c
+++ b/src/Http_Web.c
@@ -70,8 +70,8 @@ static void Http_StartNextDownload(void) {
 	res = interop_DownloadAsync(urlStr, req->requestType, req->id);
 	
 	if (res) {
-		/* Download error code -> ClassiCube error code */
-		if (res == 1) res = ERR_INVALID_URL;
+		/* interop error code -> ClassiCube error code */
+		if (res == 1) res = ERR_INVALID_DATA_URL;
 		req->result = res;
 		
 		/* Invalid URL so move onto next request */
diff --git a/src/Logger.c b/src/Logger.c
index 94d121790..1efdaf2d0 100644
--- a/src/Logger.c
+++ b/src/Logger.c
@@ -82,7 +82,8 @@ static const char* GetCCErrorDesc(cc_result res) {
 
 	case ERR_DOWNLOAD_INVALID: return "Website denied download or doesn't exist";
 	case ERR_NO_AUDIO_OUTPUT:  return "No audio output devices plugged in";
-	case ERR_INVALID_URL:      return "Cannot download from invalid URL";
+	case ERR_INVALID_DATA_URL: return "Cannot download from invalid URL";
+	case ERR_INVALID_OPEN_URL: return "Cannot navigate to invalid URL";
 	}
 	return NULL;
 }
diff --git a/src/interop_web.js b/src/interop_web.js
index fdeddea8d..093b89203 100644
--- a/src/interop_web.js
+++ b/src/interop_web.js
@@ -120,7 +120,14 @@ mergeInto(LibraryManager.library, {
 //---------------------------------------------------------Platform-------------------------------------------------------
 //########################################################################################################################
   interop_OpenTab: function(url) {
-    window.open(UTF8ToString(url));
+    try {
+      window.open(UTF8ToString(url));
+    } catch (e) {
+      // DOMException gets thrown when invalid URL provided. Test cases:
+      //   http://example:app/test.zip
+      console.log(e);
+      return 1;
+    }
     return 0;
   },
   interop_Log: function(msg, len) {