fix: handle unfilled values in mul mod runner

CHANGELOG.md

@@ -14,6 +14,8 @@
 
 * chore: Update fastecdsa python package [#1993](https://github.com/lambdaclass/cairo-vm/pull/1993)
 
+* fix: `mod_builtin_fill_memory` could be stuck in an infinite loop [#1975](https://github.com/lambdaclass/cairo-vm/issues/1975)
+
 #### [2.0.0] - 2025-02-26
 
 * fix: Check overflow in cairo pie address calculation [#1945](https://github.com/lambdaclass/cairo-vm/pull/1945)

vm/src/vm/runners/builtin_runner/modulo.rs

@@ -566,8 +566,13 @@ impl ModBuiltinRunner {
                 if let Some((_, mul_mod_runner, _)) = mul_mod {
                     if mul_mod_runner.fill_value(memory, &mul_mod_inputs, mul_mod_index)? {
                         mul_mod_index += 1;
+                        continue;
+                    } else {
+                        return Err(RunnerError::FillMemoryCoudNotFillTable(
+                            add_mod_index,
+                            mul_mod_index,
+                        ));
                     }
-                    continue;
                 }
             }