diff -urNp a/snmplib/callback.c b/snmplib/callback.c
--- a/snmplib/callback.c	2025-08-13 15:21:25.507544080 +0200
+++ b/snmplib/callback.c	2025-08-13 15:25:01.973092935 +0200
@@ -346,13 +346,17 @@ snmp_call_callbacks(int major, int minor
     /*
      * for each registered callback of type major and minor 
      */
-    for (scp = thecallbacks[major][minor]; scp != NULL; scp = scp->next) {
+    scp = thecallbacks[major][minor];
+    while (scp != NULL) {
+        struct snmp_gen_callback *scp_next = scp->next;
 
         /*
          * skip unregistered callbacks
          */
-        if(NULL == scp->sc_callback)
+        if(NULL == scp->sc_callback) {
+            scp = scp_next;
             continue;
+        }
 
         DEBUGMSGTL(("callback", "calling a callback for maj=%d min=%d\n",
                     major, minor));
@@ -363,6 +367,8 @@ snmp_call_callbacks(int major, int minor
         (*(scp->sc_callback)) (major, minor, caller_arg,
                                scp->sc_client_arg);
         count++;
+
+        scp = scp_next;
     }
 
     DEBUGMSGTL(("callback",