Fix #522

Author: rbonghi

jtop/core/processes.py

@@ -106,7 +106,7 @@ def get_process_info(self, pid, gpu_mem_usage, process_name, uptime):
         stime = float(stat[14])
         starttime = float(stat[21]) / self._clk_tck
         total_time = (utime + stime) / self._clk_tck
-        proc_uptime = uptime - starttime
+        proc_uptime = max(1, uptime - starttime)
         cpu_percent = 100 * (total_time / proc_uptime)
 
         process = [