Simplify error (user error?)

[jthole]

When I put an expression on the stack, and execute 'Simplify', I get an out of memory error.

DM42 / v0.5.1

I put 'X + Y + 3 * X' on the stack. X or Y are not stored as variables already.

Then I select the Simplify operation, and I get the following error message: "Simplify error: Out of memory".

Expected result was 'Y + 4 * X'.