makensis / logiclib crash

[Marshall7a]

I've tried attaching a debugger to this but can't really see what's going on.

Call stack of main thread
Address Stack Procedure / arguments Called from Frame
000409FC 00423B83 ? makensis.0044F8C0 makensis.00423B7E
00040A14 00422CE9 ? makensis.00423B60 makensis.00422CE4
00040A88 004239E0 ? makensis.00422650 makensis.004239DB
00040A8C 017B4501 Arg1 = 017B4501
00040AEC 00424236 ? makensis.004238D0 makensis.00424231
00040AF0 01675DD9 Arg1 = 01675DD9 ASCII " !define _${Type} ${label}
00040AF4 00000000 Arg2 = 00000000
00040AF8 00000000 Arg3 = 00000000

!define _${Type} ${label} looks suspicious, as that line is inside the macro but we haven't compiled the first line of the macro yet - otherwise my !echo should have been displayed. So I'm guessing the script is buffered (?)

My colleague tells me the failing instruction is
0044F8D7 |. 8501 |TEST DWORD PTR DS:[ECX],EAX
because ECX is not pointing to accessible memory (ECX=00032A00, EAX=00001630). So definitely something going wrong in makensis.

If I add an ${If} immediately before the ${For} , the error still occurs in the ${For}, but if I add a ${For} then the error occurs in that ${For} instead.

I am at a loss as to how to proceed with this, please someone help!