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diff --git a/ext/librethinkdbxx/test/upstream/regression/3745.yaml b/ext/librethinkdbxx/test/upstream/regression/3745.yaml
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+desc: Test that we do not crash on an error during a function called at unsharding
+table_variable_name: tbl
+tests:
+  - cd: tbl.insert([ {'id':0, 'a':5}, {'id':1, 'a':6} ])
+    ot: partial({'inserted':2})
+
+  # Test bare reduce
+  - rb: tbl.reduce{|x,y| r.object('a', r.add(x['a'], y['a']))}
+    py: tbl.reduce(lambda x,y:r.object('a', r.add(x['a'], y['a'])))
+    js: tbl.reduce(function(x,y){return r.object('a', r.add(x('a'), y('a')));})
+    ot: ({'a':11})
+
+  # Test reduce with a function that errors
+  - rb: tbl.reduce{|x,y| r.expr(0)[0]}
+    py: tbl.reduce(lambda x,y:r.expr(0)[0])
+    js: tbl.reduce(function(x,y){return r.expr(0)(0);})
+    ot: err('ReqlQueryLogicError','Cannot convert NUMBER to SEQUENCE')