1 files changed, 3 insertions, 0 deletions
diff --git a/src/solvers/opencl.rs b/src/solvers/opencl.rs
index 550ace9..431f467 100644
--- a/src/solvers/opencl.rs
+++ b/src/solvers/opencl.rs
@@ -141,6 +141,9 @@ impl GpuSolver {
     fn get_off(&self, queue: usize) -> u64 {
         let chunk = self.permutations.len() / self.n as usize;
         let off = self.permutations.len() - chunk - self.get_dim(queue);
+        if off > isize::max_value() as usize {
+            panic!("workgroup size to big, offset underflow")
+        }
         off as u64
     }
     fn get_res(&self, queue: usize) -> usize {