2 files changed, 15 insertions, 7 deletions
diff --git a/source/core/StarDirectives.cpp b/source/core/StarDirectives.cpp
index 6208b97..4db3837 100644
--- a/source/core/StarDirectives.cpp
+++ b/source/core/StarDirectives.cpp
@@ -277,8 +277,14 @@ String DirectivesGroup::toString() const {
 
 void DirectivesGroup::addToString(String& string) const {
   for (auto& directives : m_directives)
-    if (directives.shared)
-      string += directives.shared->string;
+    if (directives.shared) {
+      auto& dirString = directives.shared->string;
+      if (!dirString.empty()) {
+        if (dirString.utf8().front() != '?')
+          string += "?";
+        string += dirString;
+      }
+    }
 }
 
 void DirectivesGroup::forEach(DirectivesCallback callback) const {
diff --git a/source/game/StarParallax.cpp b/source/game/StarParallax.cpp
index fe20f95..8ebb391 100644
--- a/source/game/StarParallax.cpp
+++ b/source/game/StarParallax.cpp
@@ -60,14 +60,16 @@ Json ParallaxLayer::store() const {
 void ParallaxLayer::addImageDirectives(Directives const& newDirectives) {
   if (newDirectives) { // TODO: Move to Directives +=
     if (directives) {
-      String newString;
+      String dirString = directives.string();
 
-      for (auto const& entry : newDirectives.shared->entries) {
-        newString += "+";
-        newString += entry.string(*newDirectives.shared);
+      auto& newString = newDirectives.shared->string;
+      if (!newString.empty()) {
+        if (newString.utf8().front() != '?')
+          dirString += "?";
+        dirString += newString;
       }
 
-      directives = move(newString);
+      directives = move(dirString);
     }
     else
       directives = newDirectives;