add additional if in groupby.pyx

Author: CloseChoice

pandas/_libs/groupby.pyx

@@ -278,6 +278,7 @@ def group_cumsum(numeric_t[:, ::1] out,
                             break
                 elif numeric_t == float64_t:
                     if (val == MAXfloat64) or (val == MINfloat64):
+                        if (t == MAXfloat64) or (t == MINfloat64):
                         out[i, j] = val
                         accum[lab, j] = val
                         break