From 979344e9420fe409315281d7092e40b5f06cb250 Mon Sep 17 00:00:00 2001
From: ngiddings <nathang567@gmail.com>
Date: Sat, 17 Apr 2021 06:30:00 -0500
Subject: [PATCH] next_process() checks if a next process exists Panics if not

---
 src/kernel.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/kernel.c b/src/kernel.c
index 4412f8f..f84c88f 100644
--- a/src/kernel.c
+++ b/src/kernel.c
@@ -73,8 +73,12 @@ struct process_state_t *next_process(struct kernel_t *kernel, struct process_sta
         queue_insert(kernel->priority_queue, kernel->active_process);
     }
     kernel->active_process = extract_min(kernel->priority_queue);
-    load_address_space(kernel->active_process->page_table);
-    load_context(kernel->active_process->state);
+    if(kernel->active_process != NULL)
+    {
+        load_address_space(kernel->active_process->page_table);
+        load_context(kernel->active_process->state);
+    }
+    panic("no processes available to enter!");
 }
 
 void panic(const char *message)