MAINT: RuntimeError for unexpected integer overflow

1 files changed, 7 insertions, 0 deletions

diff --git a/numpy/lib/arraysetops.py b/numpy/lib/arraysetops.py
index 339f4e60c..8ced2f6d9 100644
--- a/numpy/lib/arraysetops.py
+++ b/numpy/lib/arraysetops.py
@@ -672,6 +672,13 @@ def in1d(ar1, ar2, assume_unique=False, invert=False, kind=None):
                                                         ar2_min]
 
             return outgoing_array
+        elif kind == 'dictionary':  # not range_safe_from_overflow
+            raise RuntimeError(
+                "You have specified kind='dictionary', "
+                "but the range of values in `ar2` exceeds the "
+                "maximum integer of the datatype. "
+                "Please set `kind` to None or 'mergesort'."
+            )
     elif kind == 'dictionary':
         raise ValueError(
             "The 'dictionary' method is only "