Index: graphspell-js/ibdawg.js
==================================================================
--- graphspell-js/ibdawg.js
+++ graphspell-js/ibdawg.js
@@ -146,11 +146,11 @@
             throw RangeError("# Error. Unknown dictionary compression method: " + this.nCompressionMethod);
         }
         // <dChar> to get the value of an arc, <dCharVal> to get the char of an arc with its value
         this.dChar = helpers.objectToMap(this.dChar);
         this.dCharVal = this.dChar.gl_reverse();
-        this.a2grams = new Set(this.l2grams);
+        this.a2grams = (this.l2grams) ? new Set(this.l2grams) : null;
 
         if (this.cStemming == "S") {
             this.funcStemming = str_transform.changeWordWithSuffixCode;
         } else if (this.cStemming == "A") {
             this.funcStemming = str_transform.changeWordWithAffixCode;
@@ -412,10 +412,13 @@
     }
 
     isNgramsOK (sChars) {
         if (sChars.length != 2) {
             return true;
+        }
+        if (!this.a2grams) {
+            return true;
         }
         return this.a2grams.has(sChars);
     }
 
     * _getCharArcs (iAddr) {

Index: graphspell/ibdawg.py
==================================================================
--- graphspell/ibdawg.py
+++ graphspell/ibdawg.py
@@ -188,11 +188,11 @@
     def _initJSON (self, oJSON):
         "initialize with a JSON text file"
         self.__dict__.update(oJSON)
         self.byDic = binascii.unhexlify(self.sByDic)
         self.dCharVal = { v: k  for k, v in self.dChar.items() }
-        self.a2grams = set(self.l2grams)
+        self.a2grams = set(self.l2grams)  if hasattr(self, 'l2grams')  else None
 
     def getInfo (self):
         "return string about the IBDAWG"
         return  "  Language: {0.sLangName}   Lang code: {0.sLangCode}   Dictionary name: {0.sDicName}" \
                 "  Compression method: {0.nCompressionMethod:>2}   Date: {0.sDate}   Stemming: {0.cStemming}FX\n" \
@@ -356,10 +356,12 @@
                 for sRepl in cp.dFinal1.get(sRemain, ()):
                     self._suggest(oSuggResult, sRepl, nMaxSwitch, nMaxDel, nMaxHardRepl, nMaxJump, nDist, nDeep+1, iAddr, sNewWord, True)
 
     def isNgramsOK (self, sChars):
         if len(sChars) != 2:
+            return True
+        if not self.a2grams:
             return True
         return sChars in self.a2grams
 
     #@timethis
     def suggest2 (self, sWord, nSuggLimit=10):