diff --git a/interface/wx/colour.h b/interface/wx/colour.h
index 8f3a8535bc..4b35c82598 100644
--- a/interface/wx/colour.h
+++ b/interface/wx/colour.h
@@ -113,10 +113,11 @@ public:
         @c wxC2S_HTML_SYNTAX, to obtain the colour as "#" followed by 6
         hexadecimal digits (e.g. wxColour(255,0,0) == "#FF0000").
 
-        This function never fails and always returns a non-empty string but
-        asserts if the colour has alpha channel (i.e. is non opaque) but
-        @c wxC2S_CSS_SYNTAX (which is the only one supporting alpha) is not
-        specified in flags.
+        This function returns empty string if the colour is not initialized
+        (see IsOk()). Otherwise, the returned string is always non-empty, but
+        the function asserts if the colour has alpha channel (i.e. is non
+        opaque) but @c wxC2S_CSS_SYNTAX (which is the only one supporting
+        alpha) is not specified in @a flags.
 
         @note For non-solid (i.e. non-RGB) colour this function returns
         "rgb(??, ?? ??)" or "#??????".
diff --git a/src/common/colourcmn.cpp b/src/common/colourcmn.cpp
index 9d0b40a46c..56ed78321a 100644
--- a/src/common/colourcmn.cpp
+++ b/src/common/colourcmn.cpp
@@ -218,6 +218,9 @@ bool wxColourBase::FromString(const wxString& str)
 
 wxString wxColourBase::GetAsString(long flags) const
 {
+    if ( !IsOk() )
+        return wxString();
+
     wxString colName;
 
     if ( IsSolid() )
diff --git a/tests/graphics/colour.cpp b/tests/graphics/colour.cpp
index ec26cfefa2..865d92f662 100644
--- a/tests/graphics/colour.cpp
+++ b/tests/graphics/colour.cpp
@@ -145,6 +145,16 @@ TEST_CASE("wxColour::FromString", "[colour][string]")
     CHECK( !wxFromString("rgba(1, 2, 3.456, foo)", &col) );
 }
 
+TEST_CASE("wxColour::GetAsString", "[colour][string]")
+{
+    CHECK( wxColour().GetAsString() == "" );
+
+    wxColour red("red");
+    CHECK( red.GetAsString() == "red" );
+    CHECK( red.GetAsString(wxC2S_CSS_SYNTAX) == "rgb(255, 0, 0)" );
+    CHECK( red.GetAsString(wxC2S_HTML_SYNTAX) == "#FF0000" );
+}
+
 TEST_CASE("wxColour::GetLuminance", "[colour][luminance]")
 {
     CHECK( wxBLACK->GetLuminance() == Approx(0.0) );