diff --git a/av1/av1_cx_iface.c b/av1/av1_cx_iface.c
index c20bfdf..d655b65 100644
--- a/av1/av1_cx_iface.c
+++ b/av1/av1_cx_iface.c
@@ -2464,10 +2464,15 @@
   const int val = CAST(AV1E_SET_TARGET_SEQ_LEVEL_IDX, args);
   const int level = val % 100;
   const int operating_point_idx = val / 100;
-  if (operating_point_idx >= 0 &&
-      operating_point_idx < MAX_NUM_OPERATING_POINTS) {
-    extra_cfg.target_seq_level_idx[operating_point_idx] = (AV1_LEVEL)level;
+  if (operating_point_idx < 0 ||
+      operating_point_idx >= MAX_NUM_OPERATING_POINTS) {
+    char *const err_string = ctx->ppi->error.detail;
+    snprintf(err_string, ARG_ERR_MSG_MAX_LEN,
+             "Invalid operating point index: %d", operating_point_idx);
+    ctx->base.err_detail = err_string;
+    return AOM_CODEC_INVALID_PARAM;
   }
+  extra_cfg.target_seq_level_idx[operating_point_idx] = (AV1_LEVEL)level;
   return update_extra_cfg(ctx, &extra_cfg);
 }
 
@@ -4053,8 +4058,12 @@
     const int val = arg_parse_int_helper(&arg, err_string);
     const int level = val % 100;
     const int operating_point_idx = val / 100;
-    if (operating_point_idx >= 0 &&
-        operating_point_idx < MAX_NUM_OPERATING_POINTS) {
+    if (operating_point_idx < 0 ||
+        operating_point_idx >= MAX_NUM_OPERATING_POINTS) {
+      snprintf(err_string, ARG_ERR_MSG_MAX_LEN,
+               "Invalid operating point index: %d", operating_point_idx);
+      err = AOM_CODEC_INVALID_PARAM;
+    } else {
       extra_cfg.target_seq_level_idx[operating_point_idx] = (AV1_LEVEL)level;
     }
   } else if (arg_match_helper(&arg,
diff --git a/test/level_test.cc b/test/level_test.cc
index 7ae1a75..cc79926 100644
--- a/test/level_test.cc
+++ b/test/level_test.cc
@@ -9,6 +9,7 @@
  * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
  */
 #include <memory>
+#include <string>
 
 #include "third_party/googletest/src/googletest/include/gtest/gtest.h"
 
@@ -78,8 +79,8 @@
   int level_[32];
 };
 
-TEST_P(LevelTest, TestTargetLevelApi) {
-  static aom_codec_iface_t *codec = aom_codec_av1_cx();
+TEST(LevelTest, TestTargetLevelApi) {
+  aom_codec_iface_t *codec = aom_codec_av1_cx();
   aom_codec_ctx_t enc;
   aom_codec_enc_cfg_t cfg;
   EXPECT_EQ(AOM_CODEC_OK, aom_codec_enc_config_default(codec, &cfg, 0));
@@ -87,10 +88,10 @@
   for (int operating_point = 0; operating_point <= 32; ++operating_point) {
     for (int level = 0; level <= 32; ++level) {
       const int target_level = operating_point * 100 + level;
-      if ((level < (CONFIG_CWG_C013 ? 28 : 20) && level != 2 && level != 3 &&
-           level != 6 && level != 7 && level != 10 && level != 11) ||
-          level == kLevelMax || level == kLevelKeepStats ||
-          operating_point > 31) {
+      if (operating_point <= 31 &&
+          ((level < (CONFIG_CWG_C013 ? 28 : 20) && level != 2 && level != 3 &&
+            level != 6 && level != 7 && level != 10 && level != 11) ||
+           level == kLevelMax || level == kLevelKeepStats)) {
         EXPECT_EQ(AOM_CODEC_OK,
                   AOM_CODEC_CONTROL_TYPECHECKED(
                       &enc, AV1E_SET_TARGET_SEQ_LEVEL_IDX, target_level));
@@ -104,6 +105,23 @@
   EXPECT_EQ(AOM_CODEC_OK, aom_codec_destroy(&enc));
 }
 
+TEST(LevelTest, InvalidOperatingPointIndexErrorDetail) {
+  aom_codec_iface_t *codec = aom_codec_av1_cx();
+  aom_codec_ctx_t enc;
+  aom_codec_enc_cfg_t cfg;
+  EXPECT_EQ(aom_codec_enc_config_default(codec, &cfg, 0), AOM_CODEC_OK);
+  EXPECT_EQ(aom_codec_enc_init(&enc, codec, &cfg, 0), AOM_CODEC_OK);
+  EXPECT_EQ(aom_codec_control(&enc, AV1E_SET_TARGET_SEQ_LEVEL_IDX, 3219),
+            AOM_CODEC_INVALID_PARAM);
+  EXPECT_EQ(aom_codec_error_detail(&enc),
+            std::string("Invalid operating point index: 32"));
+  EXPECT_EQ(aom_codec_set_option(&enc, "target-seq-level-idx", "3319"),
+            AOM_CODEC_INVALID_PARAM);
+  EXPECT_EQ(aom_codec_error_detail(&enc),
+            std::string("Invalid operating point index: 33"));
+  EXPECT_EQ(aom_codec_destroy(&enc), AOM_CODEC_OK);
+}
+
 TEST_P(LevelTest, TestTargetLevel19) {
   std::unique_ptr<libaom_test::VideoSource> video;
   video.reset(new libaom_test::Y4mVideoSource("park_joy_90p_8_420.y4m", 0, 10));