diff --git a/lib/matplotlib/mlab.py b/lib/matplotlib/mlab.py
index bcf79d84d82b..5c7d14cdec22 100644
--- a/lib/matplotlib/mlab.py
+++ b/lib/matplotlib/mlab.py
@@ -2631,8 +2631,11 @@ def key_desc(name):
if dt1.type != np.string_:
return (name, dt1.descr[0][1])
- dt2 = r1.dtype[name]
- assert dt2==dt1
+ dt2 = r2.dtype[name]
+ if dt1 != dt2:
+ msg = "The '{}' fields in arrays 'r1' and 'r2' must have the same"
+ msg += " dtype."
+ raise ValueError(msg.format(name))
if dt1.num>dt2.num:
return (name, dt1.descr[0][1])
else:
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