Access violation writing location for initializing a variable?

I'm working on some old C code and I have this error occurring at runtime for reasons I cannot understand.

Unhandled exception at 0x00A11A7C in Program.exe: 0xC0000005: Access violation writing location 0x00000034.

It is this line that the debugger stops at that throws this error:

Node *car = (Node*)malloc(sizeof(Node));

What's odd is that the program was running just fine prior. This function is called many times and just prints out car facts for each one. Suddenly on a random car this line just crashes the execution.

This is the first line of the function. How is it possible for this to be happening?