Corrected the python-magic item (typo). Also if one doesn't upgrade the requirements matrix-nio won't work.

fritzab2matrix.py

@@ -70,13 +70,20 @@ def get_last_call():
     except:
         print("Couldn't connect to Box")
     missed_calls = fc.get_missed_calls(False,1,1)
+    
+    if len(missed_calls) > 0:
         return missed_calls[0]
+    else:
+        return False
 
 def lastcall2matrix(tam,tam_no):
     # Call Watch to Matrix
     if env_call_watch and not at_least_one_new_message:
         c = get_last_call()
+        if c:
             c_msg = "{} - {} ({})".format(c.Date, c.Caller, c.Name)
+        else:
+            return False
         
         # ... and send message and file to Matrix Room
         ## if Number of a TAM and the last call match

requirements.txt

@@ -18,6 +18,6 @@ markdown
 matrix-nio # [e2e]>=0.18.3
 peewee
 Pillow
-python_magic
+python-magic
 uuid