1 files changed, 2 insertions, 0 deletions
diff --git a/pd/src/m_obj.c b/pd/src/m_obj.c
index 3f8bcda4..df8a2c12 100644
--- a/pd/src/m_obj.c
+++ b/pd/src/m_obj.c
@@ -687,6 +687,8 @@ int inlet_getsignalindex(t_inlet *x)
 {
     int n = 0;
     t_inlet *i;
+    if (x->i_symfrom != &s_signal)
+        bug("inlet_getsignalindex");
     for (i = x->i_owner->ob_inlet, n = 0; i && i != x; i = i->i_next)
         if (i->i_symfrom == &s_signal) n++;
     return (n);