diff --git a/components/synedit/Source/SynEdit.pas b/components/synedit/Source/SynEdit.pas
index 1bc2d541..7a12598e 100644
--- a/components/synedit/Source/SynEdit.pas
+++ b/components/synedit/Source/SynEdit.pas
@@ -2834,7 +2834,7 @@ begin
   for i := 1 to Length(S) do
   begin
     inc(j);
-    CountOfAvgGlyphs := Ceil(fTextDrawer.TextWidth(S[i]) / fCharWidth);
+    CountOfAvgGlyphs := Ceil(fTextDrawer.TextWidth(S[i]) / Max(fCharWidth,1));
 
     if j + CountOfAvgGlyphs > Length(Result) then
       SetLength(Result, Length(Result) + 128);
diff --git a/components/synedit/Source/SynTextDrawer.pas b/components/synedit/Source/SynTextDrawer.pas
index 52ba92a5..f6497eee 100644
--- a/components/synedit/Source/SynTextDrawer.pas
+++ b/components/synedit/Source/SynTextDrawer.pas
@@ -935,8 +935,12 @@ procedure TheTextDrawer.ExtTextOut(X, Y: Integer; Options: TTextOutOptions;
   end;
 
 begin
-  InitETODist(GetCharWidth);
-  AdjustLastCharWidthAndRect;
+  try
+    InitETODist(GetCharWidth);
+    AdjustLastCharWidthAndRect;
+  except
+    // Suppress error in threaded applications
+  end;
   UniversalExtTextOut(FDC, X, Y, Options, ARect, Text, Length, FETODist);
 end;