- fixed potential crashes in Linux crash reporter

Do not access various global objects at early stage of initialization and late stage of shutdown

src/posix/sdl/i_main.cpp

@@ -102,6 +102,12 @@ static int DoomSpecificInfo (char *buffer, char *end)
 #ifdef __VERSION__
 	p += snprintf (buffer+p, size-p, "Compiler version: %s\n", __VERSION__);
 #endif
+
+	// If Args is nullptr, then execution is at either
+	//  * early stage of initialization, additional info contains only default values
+	//  * late stage of shutdown, most likely main() was done, and accessing global variables is no longer safe
+	if (Args)
+	{
 		p += snprintf(buffer + p, size - p, "\nCommand line:");
 		for (i = 0; i < Args->NumArgs(); ++i)
 		{
@@ -135,6 +141,8 @@ static int DoomSpecificInfo (char *buffer, char *end)
 				p += snprintf(buffer + p, size - p, "\nviewangle = %f", vp.Angles.Yaw.Degrees);
 			}
 		}
+	}
+
 	buffer[p++] = '\n';
 	buffer[p++] = '\0';