diff --git a/lib/layer.js b/lib/layer.js
index 20a298c..d372ad8 100644
--- a/lib/layer.js
+++ b/lib/layer.js
@@ -252,7 +252,10 @@ class OrganizerLayer {
         }
 
         let allowedFile = false;
-        if (this.configData.allowedExtensions.length !== 0) {
+        if (
+            Array.isArray(this.configData.allowedExtensions) &&
+            this.configData.allowedExtensions.length !== 0
+        ) {
             if (isInArray(this.configData.allowedExtensions, fileExt)) {
                 allowedFile = true;
             }
@@ -260,7 +263,10 @@ class OrganizerLayer {
             allowedFile = true;
         }
 
-        if (isInArray(this.configData.ignoredExtensions, fileExt)) {
+        if (
+            Array.isArray(this.configData.ignoredExtensions) &&
+            isInArray(this.configData.ignoredExtensions, fileExt)
+        ) {
             allowedFile = false;
         }