diff --git a/scripts/spreadsheet.py b/scripts/spreadsheet.py
index a9b9e5c9..ebb37813 100755
--- a/scripts/spreadsheet.py
+++ b/scripts/spreadsheet.py
@@ -175,10 +175,16 @@ def insertStats(keys, sawData, sumRow, avgRow, devRow, beginRow, endRow, col):
                 continue
 
             try:
-                tool = data['config']['tool']
+                cfg = data['config']
+
+                try:
+                    tool = data['config']['tool']
+                except:
+                    tool = 'unknown'
+                    print("%s: unknown tool" %(name))
             except:
-                tool = 'unknown'
-                print("%s: unknown tool" %(name))
+                print("%s: no 'config' data key - I think this is not lcov performance data - skipping" % (name))
+                continue
 
             p, f = os.path.split(name)
             if os.path.splitext(f)[0] == tool: