diff --git a/src/js/static-filtering-parser.js b/src/js/static-filtering-parser.js
index 048ece0a5..15c7a581c 100644
--- a/src/js/static-filtering-parser.js
+++ b/src/js/static-filtering-parser.js
@@ -1126,6 +1126,7 @@ export class AstFilterParser {
         if ( tail !== 0 ) {
             this.linkRight(prev, tail);
         }
+        if ( this.astType !== AST_TYPE_NETWORK ) { return 0; }
         this.validateNet();
         return this.throwHeadNode(head);
     }