check that fn is fn before functioning

Author: dskvr

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@nostrwatch/nostrawl",
-  "version": "0.0.3",
+  "version": "0.0.4",
   "description": "A nostr library for continously retrieving events from nostr relays based on a set of filters.",
   "main": "src/index.js",
   "license": "MIT",

src/classes/Trawler.js

@@ -79,8 +79,8 @@ class NTTrawler {
       path: this.options.cache.path,
       compression: true
     });
-    this?.options?.after_cacheOpen(this.cache)
-    //console.log('cache opened')
+    if(this?.options && this.options instanceof Function)
+      this?.options?.after_cacheOpen(this.cache)
   }
 
   async trawl(chunk, $job){