diff --git a/prymer/primer3/primer3.py b/prymer/primer3/primer3.py
index 59b712a..33c7ab0 100644
--- a/prymer/primer3/primer3.py
+++ b/prymer/primer3/primer3.py
@@ -402,10 +402,7 @@ def design(self, design_input: Primer3Input) -> Primer3Result:  # noqa: C901
         # Check for any errors.  Typically, these are in error_lines, but also the results can
         # contain the PRIMER_ERROR key.
         if "PRIMER_ERROR" in primer3_results:
-            if "PRIMER_ERROR" in primer3_results:
-                raise ValueError("Primer3 failed: " + primer3_results["PRIMER_ERROR"])
-            else:
-                raise ValueError("Primer3 failed")
+            raise ValueError("Primer3 failed: " + primer3_results["PRIMER_ERROR"])
 
         match design_input.task:
             case DesignPrimerPairsTask():  # Primer pair design