Update app.py

app.py

@@ -161,8 +161,9 @@ def Generate_POP_Section(input_comp_section,
 
         input_seq = [input_mode_time, input_mode_dur, input_mode_ptc]
         input_seq_toks = [input_mode_time+532, input_mode_dur+660, input_mode_ptc+788]
-    
-        input_seq = input_seq_toks[:input_seq.index(0)]
+
+        if 0 in input_seq:
+            input_seq = input_seq_toks[:input_seq.index(0)]
 
         seq += input_seq