Trac #30239: comp zero check for __call__

sagemath · Jul 28, 2020 · 51ba4e3 · 51ba4e3
1 parent ddaba54
commit 51ba4e3
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/sage/tensor/modules/free_module_tensor.py b/src/sage/tensor/modules/free_module_tensor.py
@@ -2365,6 +2365,8 @@ def __call__(self, *args):
                 raise ValueError("no common basis for the components")
             omega = self._components[basis]
             vv = vector._components[basis]
+            if omega == 0 or vv == 0:
+                return self.base_ring().zero()
             resu = 0
             for i in fmodule.irange():
                 resu += omega[[i]]*vv[[i]]