diff --git a/tcl/Search.tcl b/tcl/Search.tcl
index a6716817..e995bfb1 100644
--- a/tcl/Search.tcl
+++ b/tcl/Search.tcl
@@ -360,7 +360,9 @@ proc_redirect report_clock_skew {
   } else {
     set digits $sta_report_default_digits
   }
-  report_clk_skew $clks $corner $setup_hold $digits
+  if { $clks != {} } {
+    report_clk_skew $clks $corner $setup_hold $digits
+  }
 }
 
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