Fix missing label fail

yozhikoff · yozhikoff · commit afe34c568156 · 2020-12-24T23:42:29.000+03:00
diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
@@ -293,7 +293,7 @@ def __call__(self, *args, data=None, **kwargs):
                     replaced[label_namer_idx], args[label_namer_idx])
             args = replaced
 
-        if len(args) >= 4 and not cbook.is_scalar_or_string(kwargs["label"]):
+        if len(args) >= 4 and not cbook.is_scalar_or_string(kwargs.get("label")):
             raise ValueError("plot() with multiple groups of data (i.e., "
                              "pairs of x and y) does not support multiple "
                              "labels")
