Hello Andrew,

running glpsol --cuts on the following model gives an error 

Model has been successfully generated
ipp_basic_tech:  5 row(s) and 0 column(s) removed
Assertion failed: ipp != ipp
Error detected in file ..\src\glpipp02.c at line 801

glpsol --version
GLPSOL: GLPK LP/MIP Solver 4.28

Best regards

Xypron

param a ,integer;
param b ,integer;
param c ,integer;
var x integer;
var y integer;

st1: a*x + b*y >= 21;
st1a: a*x + b*y <= 33;
st2: x >= 1;
st3: x <= 10000;
st4: y >= -10000;
st5: y <= -1;
minimize m: a *x + b * y;

solve;

display x, y;

data;

param a := 51;
param b := 34;

end;

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