diff --git a/pdf/model/resources.go b/pdf/model/resources.go
index 56263be6..cc479f53 100644
--- a/pdf/model/resources.go
+++ b/pdf/model/resources.go
@@ -40,7 +40,7 @@ func NewPdfPageResourcesFromDict(dict *PdfObjectDictionary) (*PdfPageResources,
 	if obj, isDefined := (*dict)["ExtGState"]; isDefined {
 		r.ExtGState = obj
 	}
-	if obj, isDefined := (*dict)["ColorSpace"]; isDefined {
+	if obj, isDefined := (*dict)["ColorSpace"]; isDefined && !isNullObject(obj) {
 		colorspaces, err := newPdfPageResourcesColorspacesFromPdfObject(obj)
 		if err != nil {
 			return nil, err
diff --git a/pdf/model/utils.go b/pdf/model/utils.go
index 834beb32..14e3650b 100644
--- a/pdf/model/utils.go
+++ b/pdf/model/utils.go
@@ -28,6 +28,14 @@ func getNumberAsFloat(obj PdfObject) (float64, error) {
 	return 0, errors.New("Not a number")
 }
 
+func isNullObject(obj PdfObject) bool {
+	if _, isNull := obj.(*PdfObjectNull); isNull {
+		return true
+	} else {
+		return false
+	}
+}
+
 // Convert a list of pdf objects representing floats or integers to a slice of float64 values.
 func getNumbersAsFloat(objects []PdfObject) ([]float64, error) {
 	floats := []float64{}