Index: src/LineInput.cc
===================================================================
--- src/LineInput.cc	(revision 780)
+++ src/LineInput.cc	(working copy)
@@ -907,6 +907,9 @@
                    lec.paste();
                    continue;
 
+              case Invalid_Unicode:
+                   continue;
+
               default:  // regular APL character
                    lec.insert_char(uni);
                    continue;
@@ -1016,10 +1019,6 @@
               //
               if (ESCmap::need_more(seq, s))   continue;
 
-              CERR << endl << "Unknown ESC sequence: ESC";
-              loop(ss, s)   CERR << " " << HEX2(seq[ss + 1]);
-              CERR << endl;
-
               return Invalid_Unicode;
             }
       }