diff --git a/lib/eslint/flat-eslint.js b/lib/eslint/flat-eslint.js
index d5911853172..479d5f14f2c 100644
--- a/lib/eslint/flat-eslint.js
+++ b/lib/eslint/flat-eslint.js
@@ -688,6 +688,10 @@ class FlatESLint {
             const allMessages = result.messages.concat(result.suppressedMessages);
 
             for (const { ruleId } of allMessages) {
+                if (!ruleId) {
+                    continue;
+                }
+
                 const rule = getRuleFromConfig(ruleId, config);
 
                 // ensure the rule exists
diff --git a/tests/lib/eslint/eslint.js b/tests/lib/eslint/eslint.js
index 9a3ee9b2538..112f0c85ae8 100644
--- a/tests/lib/eslint/eslint.js
+++ b/tests/lib/eslint/eslint.js
@@ -4987,6 +4987,7 @@ describe("ESLint", () => {
             const results = await engine.lintText("a");
             const rulesMeta = engine.getRulesMetaForResults(results);
 
+            assert.strictEqual(Object.keys(rulesMeta).length, 1);
             assert.strictEqual(rulesMeta.semi, coreRules.get("semi").meta);
         });
 
@@ -5003,6 +5004,7 @@ describe("ESLint", () => {
             const results = await engine.lintText("a // eslint-disable-line semi");
             const rulesMeta = engine.getRulesMetaForResults(results);
 
+            assert.strictEqual(Object.keys(rulesMeta).length, 1);
             assert.strictEqual(rulesMeta.semi, coreRules.get("semi").meta);
         });
 
@@ -5051,6 +5053,51 @@ describe("ESLint", () => {
                 nodePlugin.rules["no-new-require"].meta
             );
         });
+
+        it("should ignore messages not related to a rule", async () => {
+            const engine = new ESLint({
+                useEslintrc: false,
+                overrideConfig: {
+                    ignorePatterns: "ignored.js",
+                    rules: {
+                        "no-var": "warn"
+                    }
+                },
+                reportUnusedDisableDirectives: "warn"
+            });
+
+            {
+                const results = await engine.lintText("syntax error");
+                const rulesMeta = engine.getRulesMetaForResults(results);
+
+                assert.deepStrictEqual(rulesMeta, {});
+            }
+            {
+                const results = await engine.lintText("// eslint-disable-line no-var");
+                const rulesMeta = engine.getRulesMetaForResults(results);
+
+                assert.deepStrictEqual(rulesMeta, {});
+            }
+            {
+                const results = await engine.lintText("", { filePath: "ignored.js", warnIgnored: true });
+                const rulesMeta = engine.getRulesMetaForResults(results);
+
+                assert.deepStrictEqual(rulesMeta, {});
+            }
+        });
+
+        it("should return a non-empty value if some of the messages are related to a rule", async () => {
+            const engine = new ESLint({
+                useEslintrc: false,
+                overrideConfig: { rules: { "no-var": "warn" } },
+                reportUnusedDisableDirectives: "warn"
+            });
+
+            const results = await engine.lintText("// eslint-disable-line no-var\nvar foo;");
+            const rulesMeta = engine.getRulesMetaForResults(results);
+
+            assert.deepStrictEqual(rulesMeta, { "no-var": coreRules.get("no-var").meta });
+        });
     });
 
     describe("outputFixes()", () => {
diff --git a/tests/lib/eslint/flat-eslint.js b/tests/lib/eslint/flat-eslint.js
index be2a5d617ce..9e2b694f9c8 100644
--- a/tests/lib/eslint/flat-eslint.js
+++ b/tests/lib/eslint/flat-eslint.js
@@ -3770,6 +3770,24 @@ describe("FlatESLint", () => {
             const results = await engine.lintText("a", { filePath: "foo.js" });
             const rulesMeta = engine.getRulesMetaForResults(results);
 
+            assert.strictEqual(Object.keys(rulesMeta).length, 1);
+            assert.strictEqual(rulesMeta.semi, coreRules.get("semi").meta);
+        });
+
+        it("should return one rule meta when there is a suppressed linting error", async () => {
+            const engine = new FlatESLint({
+                overrideConfigFile: true,
+                overrideConfig: {
+                    rules: {
+                        semi: 2
+                    }
+                }
+            });
+
+            const results = await engine.lintText("a // eslint-disable-line semi");
+            const rulesMeta = engine.getRulesMetaForResults(results);
+
+            assert.strictEqual(Object.keys(rulesMeta).length, 1);
             assert.strictEqual(rulesMeta.semi, coreRules.get("semi").meta);
         });
 
@@ -3817,6 +3835,51 @@ describe("FlatESLint", () => {
                 nodePlugin.rules["no-new-require"].meta
             );
         });
+
+        it("should ignore messages not related to a rule", async () => {
+            const engine = new FlatESLint({
+                overrideConfigFile: true,
+                ignorePatterns: "ignored.js",
+                overrideConfig: {
+                    rules: {
+                        "no-var": "warn"
+                    }
+                },
+                reportUnusedDisableDirectives: "warn"
+            });
+
+            {
+                const results = await engine.lintText("syntax error");
+                const rulesMeta = engine.getRulesMetaForResults(results);
+
+                assert.deepStrictEqual(rulesMeta, {});
+            }
+            {
+                const results = await engine.lintText("// eslint-disable-line no-var");
+                const rulesMeta = engine.getRulesMetaForResults(results);
+
+                assert.deepStrictEqual(rulesMeta, {});
+            }
+            {
+                const results = await engine.lintText("", { filePath: "ignored.js", warnIgnored: true });
+                const rulesMeta = engine.getRulesMetaForResults(results);
+
+                assert.deepStrictEqual(rulesMeta, {});
+            }
+        });
+
+        it("should return a non-empty value if some of the messages are related to a rule", async () => {
+            const engine = new FlatESLint({
+                overrideConfigFile: true,
+                overrideConfig: { rules: { "no-var": "warn" } },
+                reportUnusedDisableDirectives: "warn"
+            });
+
+            const results = await engine.lintText("// eslint-disable-line no-var\nvar foo;");
+            const rulesMeta = engine.getRulesMetaForResults(results);
+
+            assert.deepStrictEqual(rulesMeta, { "no-var": coreRules.get("no-var").meta });
+        });
     });
 
     describe("outputFixes()", () => {