diff --git a/src/engine/fileOps.cpp b/src/engine/fileOps.cpp
index 37ab0f83..6240f3f5 100644
--- a/src/engine/fileOps.cpp
+++ b/src/engine/fileOps.cpp
@@ -550,6 +550,11 @@ bool DivEngine::loadDMF(unsigned char* file, size_t len) {
               pat->data[k][1]-=2;
             }
           }
+          if (pat->data[k][0]==0 && pat->data[k][1]!=0) {
+            logD("what? %d:%d:%d note %d octave %d\n",i,j,k,pat->data[k][0],pat->data[k][1]);
+            pat->data[k][0]=12;
+            pat->data[k][1]--;
+          }
           // volume
           pat->data[k][3]=reader.readS();
           if (ds.version<0x0a) {
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index b19d461e..dab64bbb 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -98,6 +98,8 @@ const char* FurnaceGUI::noteName(short note, short octave) {
     return "REL";
   } else if (octave==0 && note==0) {
     return "...";
+  } else if (note==0 && octave!=0) {
+    return "BUG";
   }
   int seek=(note+(signed char)octave*12)+60;
   if (seek<0 || seek>=180) {