diff --git a/db_stress_tool/batched_ops_stress.cc b/db_stress_tool/batched_ops_stress.cc
index d624af9c66..5ecef42eee 100644
--- a/db_stress_tool/batched_ops_stress.cc
+++ b/db_stress_tool/batched_ops_stress.cc
@@ -615,10 +615,15 @@ class BatchedOpsStressTest : public StressTest {
                iters[i]->key().starts_with(prefix_slices[i]));
 
         if (ro_copies[i].allow_unprepared_value) {
+          // Save key in case PrepareValue fails and invalidates the iterator
+          const std::string prepare_value_key =
+              iters[i]->key().ToString(/* hex */ true);
+
           if (!iters[i]->PrepareValue()) {
             fprintf(stderr,
                     "prefix scan error: PrepareValue failed for key %s\n",
-                    iters[i]->key().ToString(/* hex */ true).c_str());
+                    prepare_value_key.c_str());
+            continue;
           }
         }
 
diff --git a/db_stress_tool/db_stress_test_base.cc b/db_stress_tool/db_stress_test_base.cc
index 2a7ea050ce..5dd4fe8782 100644
--- a/db_stress_tool/db_stress_test_base.cc
+++ b/db_stress_tool/db_stress_test_base.cc
@@ -2001,13 +2001,17 @@ void StressTest::VerifyIterator(
 
   if (!*diverged && iter->Valid()) {
     if (ro.allow_unprepared_value) {
+      // Save key in case PrepareValue fails and invalidates the iterator
+      const std::string prepare_value_key =
+          iter->key().ToString(/* hex */ true);
+
       if (!iter->PrepareValue()) {
         fprintf(
             stderr,
             "Iterator failed to prepare value for key %s %s under specified "
             "iterator ReadOptions: %s (Empty string or missing field indicates "
             "default option or value is used)\n",
-            iter->key().ToString(true).c_str(), op_logs.c_str(),
+            prepare_value_key.c_str(), op_logs.c_str(),
             read_opt_oss.str().c_str());
         *diverged = true;
       }
diff --git a/db_stress_tool/no_batched_ops_stress.cc b/db_stress_tool/no_batched_ops_stress.cc
index 62bf3ca859..9485bca777 100644
--- a/db_stress_tool/no_batched_ops_stress.cc
+++ b/db_stress_tool/no_batched_ops_stress.cc
@@ -2301,12 +2301,16 @@ class NonBatchedOpsStressTest : public StressTest {
       assert(iter->Valid());
 
       if (ro.allow_unprepared_value) {
+        // Save key in case PrepareValue fails and invalidates the iterator
+        const std::string prepare_value_key =
+            iter->key().ToString(/* hex */ true);
+
         if (!iter->PrepareValue()) {
           shared->SetVerificationFailure();
 
           fprintf(stderr,
                   "Verification failed for key %s: failed to prepare value\n",
-                  Slice(iter->key()).ToString(/* hex */ true).c_str());
+                  prepare_value_key.c_str());
           fprintf(stderr, "Column family: %s, op_logs: %s\n",
                   cfh->GetName().c_str(), op_logs.c_str());