diff --git a/aviary/interface/reports.py b/aviary/interface/reports.py
index 479eaf816..301e75cbc 100644
--- a/aviary/interface/reports.py
+++ b/aviary/interface/reports.py
@@ -410,15 +410,22 @@ def abs2prom(abs_name):
 
             for var in sorted(bare_hierarchy_inputs):
                 metadata = aviary_metadata.get(var)
+                abs_paths = prom2abs(var)
+
                 try:
                     units = metadata['units']
-                except:
+                except (TypeError, KeyError):
                     metadata = aviary_metadata.get(var.split('.')[-1])
-                    units = metadata['units']
+
+                    try:
+                        units = metadata['units']
+                    except (TypeError, KeyError):
+                        # This happens when the var is not defined in metadata.
+                        metadata = prob.model.get_io_metadata('input')[abs_paths[0]]
+                        units = metadata['units']
 
                 val = prob.model.get_val(var, units=units)
                 desc = metadata['desc']
-                abs_paths = prom2abs(var)
 
                 f.write(f'| **{var}** | {val} | {units} | {desc} | {abs_paths}|\n')
 
diff --git a/aviary/interface/test/test_reports.py b/aviary/interface/test/test_reports.py
index c21bc1832..d8a72c646 100644
--- a/aviary/interface/test/test_reports.py
+++ b/aviary/interface/test/test_reports.py
@@ -89,15 +89,20 @@ def test_timeseries_report(self):
     @set_env_vars(TESTFLO_RUNNING='0', OPENMDAO_REPORTS='check_input_report')
     def test_check_input_report(self):
         # Make sure the input check works with custom metadata.
+        # Make sure it also works when a user forgets to create metadata.
 
         class ExtraBuilder(SubsystemBuilderBase):
             def build_pre_mission(self, aviary_inputs):
-                comp = om.ExecComp('z = 2*x')
+                comp = om.ExecComp(['z = 2*x', 'p = q'])
                 wing_group = om.Group()
                 wing_group.add_subsystem(
                     'aerostructures',
                     comp,
-                    promotes_inputs=[('x', 'aircraft:custom_var')],
+                    promotes_inputs=[
+                        ('x', 'aircraft:custom_var'),
+                        ('q', 'aircraft:forgotten_input'),
+                    ],
+                    promotes_outputs=[('p', 'aircraft:forgotten_out')],
                 )
                 return wing_group