diff --git a/pkg/artifacts/signable.go b/pkg/artifacts/signable.go
index 713b43f015..4f4389e8ec 100644
--- a/pkg/artifacts/signable.go
+++ b/pkg/artifacts/signable.go
@@ -266,6 +266,10 @@ func extractTargetFromResults(obj objects.TektonObject, identifierSuffix string,
 
 	for _, res := range obj.GetResults() {
 		if strings.HasSuffix(res.Name, identifierSuffix) {
+			if res.Value.StringVal == "" {
+				logger.Debugf("error getting string value for %s", res.Name)
+				continue
+			}
 			marker := strings.TrimSuffix(res.Name, identifierSuffix)
 			if v, ok := ss[marker]; ok {
 				v.URI = strings.TrimSpace(res.Value.StringVal)
@@ -276,6 +280,10 @@ func extractTargetFromResults(obj objects.TektonObject, identifierSuffix string,
 			// TODO: add logic for Intoto signable target as input.
 		}
 		if strings.HasSuffix(res.Name, digestSuffix) {
+			if res.Value.StringVal == "" {
+				logger.Debugf("error getting string value for %s", res.Name)
+				continue
+			}
 			marker := strings.TrimSuffix(res.Name, digestSuffix)
 			if v, ok := ss[marker]; ok {
 				v.Digest = strings.TrimSpace(res.Value.StringVal)
@@ -319,23 +327,11 @@ func ExtractStructuredTargetFromResults(obj objects.TektonObject, categoryMarker
 
 	// TODO(#592): support structured results using Run
 	results := []objects.Result{}
-	tr, isTaskRun := obj.GetObject().(*v1beta1.TaskRun)
-	if isTaskRun {
-		for _, res := range tr.Status.TaskRunResults {
-			results = append(results, objects.Result{
-				Name:  res.Name,
-				Value: res.Value,
-			})
-		}
-
-	} else {
-		pr := obj.GetObject().(*v1beta1.PipelineRun)
-		for _, res := range pr.Status.PipelineResults {
-			results = append(results, objects.Result{
-				Name:  res.Name,
-				Value: res.Value,
-			})
-		}
+	for _, res := range obj.GetResults() {
+		results = append(results, objects.Result{
+			Name:  res.Name,
+			Value: res.Value,
+		})
 	}
 	for _, res := range results {
 		if strings.HasSuffix(res.Name, categoryMarker) {
diff --git a/pkg/artifacts/signable_test.go b/pkg/artifacts/signable_test.go
index f44105f55c..291197b18f 100644
--- a/pkg/artifacts/signable_test.go
+++ b/pkg/artifacts/signable_test.go
@@ -320,6 +320,8 @@ func TestExtractOCIImagesFromResults(t *testing.T) {
 					{Name: "IMAGE_DIGEST", Value: *v1beta1.NewArrayOrString(digest1)},
 					{Name: "img4_IMAGE_URL", Value: *v1beta1.NewArrayOrString("img4")},
 					{Name: "img5_IMAGE_DIGEST", Value: *v1beta1.NewArrayOrString("sha123:abc")},
+					{Name: "empty_str_IMAGE_DIGEST", Value: *v1beta1.NewArrayOrString("")},
+					{Name: "empty_str_IMAGE_URL", Value: *v1beta1.NewArrayOrString("")},
 				},
 			},
 		},
diff --git a/pkg/chains/objects/objects.go b/pkg/chains/objects/objects.go
index 9e9828d434..dc96b620d4 100644
--- a/pkg/chains/objects/objects.go
+++ b/pkg/chains/objects/objects.go
@@ -176,11 +176,8 @@ func (pro *PipelineRunObject) GetResults() []Result {
 	res := []Result{}
 	for _, key := range pro.Status.PipelineResults {
 		res = append(res, Result{
-			Name: key.Name,
-			Value: v1beta1.ArrayOrString{
-				Type:      v1beta1.ParamTypeString,
-				StringVal: key.Value.StringVal,
-			},
+			Name:  key.Name,
+			Value: key.Value,
 		})
 	}
 	return res
diff --git a/pkg/chains/objects/objects_test.go b/pkg/chains/objects/objects_test.go
index b65b29de21..e71f7cb92a 100644
--- a/pkg/chains/objects/objects_test.go
+++ b/pkg/chains/objects/objects_test.go
@@ -43,7 +43,21 @@ func getTaskRun() *v1beta1.TaskRun {
 			Name:      "foo",
 			Namespace: "objects-test",
 		},
-		Spec: v1beta1.TaskRunSpec{},
+		Status: v1beta1.TaskRunStatus{
+			TaskRunStatusFields: v1beta1.TaskRunStatusFields{
+				TaskRunResults: []v1beta1.TaskRunResult{
+					{
+						Name: "img1_input_ARTIFACT_INPUTS",
+						Value: *v1beta1.NewObject(map[string]string{
+							"uri":    "gcr.io/foo/bar",
+							"digest": "sha256:05f95b26ed10668b7183c1e2da98610e91372fa9f510046d4ce5812addad86b7",
+						}),
+					},
+					{Name: "mvn1_ARTIFACT_URI", Value: *v1beta1.NewArrayOrString("projects/test-project/locations/us-west4/repositories/test-repo/mavenArtifacts/com.google.guava:guava:31.0-jre")},
+					{Name: "mvn1_ARTIFACT_DIGEST", Value: *v1beta1.NewArrayOrString("sha256:05f95b26ed10668b7183c1e2da98610e91372fa9f510046d4ce5812addad86b5")},
+				},
+			},
+		},
 	}
 }
 
@@ -54,6 +68,21 @@ func getPipelineRun() *v1beta1.PipelineRun {
 			Namespace: "objects-test",
 		},
 		Spec: v1beta1.PipelineRunSpec{},
+		Status: v1beta1.PipelineRunStatus{
+			PipelineRunStatusFields: v1beta1.PipelineRunStatusFields{
+				PipelineResults: []v1beta1.PipelineRunResult{
+					{
+						Name: "img1_input_ARTIFACT_INPUTS",
+						Value: *v1beta1.NewObject(map[string]string{
+							"uri":    "gcr.io/foo/bar",
+							"digest": "sha256:05f95b26ed10668b7183c1e2da98610e91372fa9f510046d4ce5812addad86b7",
+						}),
+					},
+					{Name: "mvn1_ARTIFACT_URI", Value: *v1beta1.NewArrayOrString("projects/test-project/locations/us-west4/repositories/test-repo/mavenArtifacts/com.google.guava:guava:31.0-jre")},
+					{Name: "mvn1_ARTIFACT_DIGEST", Value: *v1beta1.NewArrayOrString("sha256:05f95b26ed10668b7183c1e2da98610e91372fa9f510046d4ce5812addad86b5")},
+				},
+			},
+		},
 	}
 }
 
@@ -127,3 +156,43 @@ func TestPipelineRun_ImagePullSecrets(t *testing.T) {
 		})
 	}
 }
+
+func TestPipelineRun_GetResults(t *testing.T) {
+
+	t.Run("TestPipelineRun_GetResults", func(t *testing.T) {
+		pr := NewPipelineRunObject(getPipelineRun())
+		got := pr.GetResults()
+		assert.ElementsMatch(t, got, []Result{
+			{
+				Name: "img1_input_ARTIFACT_INPUTS",
+				Value: *v1beta1.NewObject(map[string]string{
+					"uri":    "gcr.io/foo/bar",
+					"digest": "sha256:05f95b26ed10668b7183c1e2da98610e91372fa9f510046d4ce5812addad86b7",
+				}),
+			},
+			{Name: "mvn1_ARTIFACT_URI", Value: *v1beta1.NewArrayOrString("projects/test-project/locations/us-west4/repositories/test-repo/mavenArtifacts/com.google.guava:guava:31.0-jre")},
+			{Name: "mvn1_ARTIFACT_DIGEST", Value: *v1beta1.NewArrayOrString("sha256:05f95b26ed10668b7183c1e2da98610e91372fa9f510046d4ce5812addad86b5")},
+		})
+	})
+
+}
+
+func TestTaskRun_GetResults(t *testing.T) {
+
+	t.Run("TestTaskRun_GetResults", func(t *testing.T) {
+		pr := NewTaskRunObject(getTaskRun())
+		got := pr.GetResults()
+		assert.ElementsMatch(t, got, []Result{
+			{
+				Name: "img1_input_ARTIFACT_INPUTS",
+				Value: *v1beta1.NewObject(map[string]string{
+					"uri":    "gcr.io/foo/bar",
+					"digest": "sha256:05f95b26ed10668b7183c1e2da98610e91372fa9f510046d4ce5812addad86b7",
+				}),
+			},
+			{Name: "mvn1_ARTIFACT_URI", Value: *v1beta1.NewArrayOrString("projects/test-project/locations/us-west4/repositories/test-repo/mavenArtifacts/com.google.guava:guava:31.0-jre")},
+			{Name: "mvn1_ARTIFACT_DIGEST", Value: *v1beta1.NewArrayOrString("sha256:05f95b26ed10668b7183c1e2da98610e91372fa9f510046d4ce5812addad86b5")},
+		})
+	})
+
+}