Gurobi crashes in the cbcut

Hi Gurobi community,

I'm using Python Gurobi interface on linux. I'm using a callback function to add a set of valid inequalities. My callback looks like this:

def mycallback(m, where):

     if where == GRB.Callback.MIPNODE:

           SOME LAZY CUTS ... (This part works perfectly)

     if where == GRB.Callback.MIPNODE:

      sol_beta = m.cbGetNodeRel(Beta)
      sol_g = m.cbGetNodeRel(g)
      sol_v = m.cbGetNodeRel(v_var)

       rhs1=LinExpr()
       rhs2= LinExpr()
       lhs = LinExpr()
       bar_beta1={}
       index=-1
       CNUM1={}
      

       for j,k in List_edges:
           index +=1
           if sol_g[j,k] >=0.0000001:
               if sol_v[j,k] +0.00001 <= (2*sol_beta[j,k])*sol_beta[j,k] +(-1*sol_beta[j,k]*sol_beta[j,k])*sol_g[j,k]:
                      bar_beta1[index] = (sol_beta[j,k])/float(sol_g[j,k])
                      lhs= m._v_var[index]
                      rhs1 = (2*bar_beta1[index])*m._beta_var[index]
                      rhs2= (-1*bar_beta1[index]*bar_beta1[index])*m._g_var[index]

                      CNUM1[index]=m.cbCut(lhs - rhs1- rhs2 >= 0)

m.params.PreCrush = 1
m.Params.lazyConstraints = 1

m._v_var = m.getVars()[:len(List_edges)]
m._beta_var = m.getVars()[len(List_edges):2*len(List_edges)]
m._g_var = m.getVars()[2*len(List_edges):3*len(List_edges)]

m.optimize(mycallback)

When I use m.cbCut(lhs -rhs1>=0), I can run my model fine. However, the current model gives me an strange error which I cannot debug. The error is as follows:

*** Error in `/home/hasan/Packages/anaconda2/bin/python2.7': realloc(): invalid next size: 0x000055d3d4818990 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7fa4d83df7e5]
/lib/x86_64-linux-gnu/libc.so.6(+0x834aa)[0x7fa4d83eb4aa]
/lib/x86_64-linux-gnu/libc.so.6(realloc+0x179)[0x7fa4d83ec839] ...

I really appreciate your help. What could be the source of the problem.