diff --git a/src/backend.c b/src/backend.c
index 4970412e1..1cc3af167 100644
--- a/src/backend.c
+++ b/src/backend.c
@@ -3394,6 +3394,8 @@ int run_kernel (hashcat_ctx_t *hashcat_ctx, hc_device_param_t *device_param, con
       }
     }
 
+    if (kernel_threads == 0) kernel_threads = 1;
+
     num_elements = CEILDIV (num_elements, kernel_threads);
 
     if ((hashconfig->opts_type & OPTS_TYPE_PT_BITSLICE) && (user_options->attack_mode == ATTACK_MODE_BF))
diff --git a/src/hashes.c b/src/hashes.c
index 159ae47ac..51abdb6c2 100644
--- a/src/hashes.c
+++ b/src/hashes.c
@@ -470,7 +470,7 @@ int check_cracked (hashcat_ctx_t *hashcat_ctx, hc_device_param_t *device_param,
 
   salt_t *salt_buf = &hashes->salts_buf[salt_pos];
 
-  u32 num_cracked;
+  u32 num_cracked = 0;
 
   int CU_rc;
   int CL_rc;
diff --git a/src/selftest.c b/src/selftest.c
index 9e9e40f8e..84eb88542 100644
--- a/src/selftest.c
+++ b/src/selftest.c
@@ -569,7 +569,7 @@ static int selftest (hashcat_ctx_t *hashcat_ctx, hc_device_param_t *device_param
 
   // check : check if cracked
 
-  u32 num_cracked;
+  u32 num_cracked = 0;
 
   if (device_param->is_cuda == true)
   {
@@ -677,6 +677,7 @@ static int selftest (hashcat_ctx_t *hashcat_ctx, hc_device_param_t *device_param
   if (num_cracked == 0)
   {
     hc_thread_mutex_lock (status_ctx->mux_display);
+
     if (device_param->is_opencl == true)
     {
       event_log_error (hashcat_ctx, "* Device #%u: ATTENTION! OpenCL kernel self-test failed.", device_param->device_id + 1);