row merge error

Can anyone tell me what could cause the following error:

netsnmp_assert saved_requests[i] == request failed helpers/row_merge.c:270 netsnmp_row_merge_helper_handler()

I use the following registration:

    /*reg tables ***************************************/
    handler_ptr = netsnmp_create_handler("sysContactTable", sysContactTable_handler);
    if(!handler_ptr)
    {
      TRACE_LOG( TRACE_SNMP, TRACE_INFO, "Memory allocation failed for snmp mib init.");
      return;
    }
    reg = netsnmp_handler_registration_create("sysContactTableChain",
                                   handler_ptr,
                                   sysContactTable_oid,
                                   OID_LENGTH(sysContactTable_oid),
                                   HANDLER_CAN_RWRITE);
    if(reg == NULL)
    {
      netsnmp_handler_free(handler_ptr);
      return;
    }
    table_info = SNMP_MALLOC_TYPEDEF(netsnmp_table_registration_info);
    if(!verifyTableInfo(table_info))
    {
      netsnmp_handler_free(handler_ptr);
      netsnmp_handler_registration_free(reg);
      return;
    }
    netsnmp_table_helper_add_indexes(table_info, ASN_INTEGER,
      /* index: ovnNGSysContactIndex */0);
    table_info->min_column = COLUMN_SYSCONTACTNAME;
    table_info->max_column = COLUMN_SYSCONTACTEMAIL;
    netsnmp_register_table(reg, table_info);
    handler_ptr2 = netsnmp_get_row_merge_handler(reg->rootoid_len + 2);
    if(!handler_ptr2)
    {
      SNMP_FREE(table_info);
      netsnmp_handler_registration_free(reg);
      return;
    }
    netsnmp_inject_handler(reg, handler_ptr2);

Thanks


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