minor fix

MuellerSeb · MuellerSeb · commit abf7da5dba6d · 2023-04-18T09:52:29.000+02:00
diff --git a/src/welltestpy/estimate/spotpylib.py b/src/welltestpy/estimate/spotpylib.py
@@ -43,6 +43,7 @@ def _lin(x):
 
 def _is_callable_tuple(input):
     result = False
+    length = 0
     try:
         length = len(input)
     except TypeError:
