@@ -311,10 +311,13 @@
         return Boolean(this._convBytesToInteger(this.byDic.slice(iAddr, iAddr+this.nBytesArc)) & this._finalNodeMask);
     }
 
     getMorph (sWord) {
         // retrieves morphologies list, different casing allowed
+        if (!sWord) {
+            return [];
+        }
         sWord = str_transform.spellingNormalization(sWord);
         let l = this.morph(sWord);
         if (sWord[0].gl_isUpperCase()) {
             l.push(...this.morph(sWord.toLowerCase()));
             if (sWord.gl_isUpperCase() && sWord.length > 1) {