diff --git a/Logic/Tags/Tag.ts b/Logic/Tags/Tag.ts
index 803b79390..005fa95ba 100644
--- a/Logic/Tags/Tag.ts
+++ b/Logic/Tags/Tag.ts
@@ -18,6 +18,10 @@ export class Tag extends TagsFilter {
         if (value === "*") {
             console.warn(`Got suspicious tag ${key}=*   ; did you mean ${key}~* ?`)
         }
+        if(value.indexOf("&") >= 0){
+            const tags = (key + "="+value).split("&")
+            throw `Invalid value for a tag: it contains '&'. You probably meant to use '{"and":[${tags.map(kv => "\"" + kv +"\"").join(', ')}]}'`
+        }
     }