diff --git a/lib/converter/BucketNodeConverter.ts b/lib/converter/BucketNodeConverter.ts
index 95c46c2..26921fe 100644
--- a/lib/converter/BucketNodeConverter.ts
+++ b/lib/converter/BucketNodeConverter.ts
@@ -56,7 +56,10 @@ export class BucketNodeConverter implements NodeConverterInterface {
 
             let patternType: string
 
-            if (match.hasOwnProperty(options.bucketPattern.patternTypeGroupName)) {
+            if (
+              match.hasOwnProperty(options.bucketPattern.patternTypeGroupName) &&
+              match[options.bucketPattern.patternTypeGroupName] !== undefined
+            ) {
               patternType = match[options.bucketPattern.patternTypeGroupName]
             } else {
               this._log.warn(
diff --git a/package.json b/package.json
index e876d41..9fe2da1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "socko-converter-file",
-  "version": "0.4.0",
+  "version": "0.5.0",
   "description": "Converting file hierarchies to SOCKO! nodes",
   "keywords": [
     "socko",