diff --git a/pytorch_lightning/root_module/memory.py b/pytorch_lightning/root_module/memory.py
index 909f97f119..17fbe99197 100644
--- a/pytorch_lightning/root_module/memory.py
+++ b/pytorch_lightning/root_module/memory.py
@@ -121,7 +121,7 @@ class ModelSummary(object):
         df['Type'] = self.layer_types
         df['Params'] = self.param_nums
 
-        if self.model.example_input_array:
+        if self.model.example_input_array is not None:
             df.columns.extend(['In_sizes', 'Out_sizes'])
             df['In_sizes'] = self.in_sizes
             df['Out_sizes'] = self.out_sizes
@@ -134,7 +134,7 @@ class ModelSummary(object):
         self.get_parameter_sizes()
         self.get_parameter_nums()
 
-        if self.model.example_input_array:
+        if self.model.example_input_array is not None:
             self.get_variable_sizes()
         self.make_summary()