Update jquery.inputmask.js

jquery.inputmask.js

@@ -840,7 +840,7 @@ This plugin is based on the masked input plugin written by Josh Bush (digitalbus
                                 prepareBuffer(buffer, p, isRTL);
                                 if ((np = isValid(p, c, buffer, false)) !== false) {
                                     if (np !== true) p = np; //set new position from isValid
-                                    if (opts.insertMode == true) shiftR(p, maskL, c); else setBufferElement(buffer, p, c);
+                                    if (opts.insertMode == true) shiftR(p, buffer.length, c); else setBufferElement(buffer, p, c);
                                     var next = seekNext(buffer, p);
                                     writeBuffer(input, buffer, next);