diff --git a/scripts/drag_drop_handler.lua b/scripts/drag_drop_handler.lua
index 36c2bd25ce..f981d3abd1 100644
--- a/scripts/drag_drop_handler.lua
+++ b/scripts/drag_drop_handler.lua
@@ -33,6 +33,7 @@ local ReloadUIScript = [[ if openspace.hasProperty('Modules.CefWebGui.Reload') t
 
 if is_image_file(extension) then
   identifier = basename_without_extension:gsub(" ", "_")
+  identifier = identifier:gsub(".", "_")
   return [[openspace.addScreenSpaceRenderable({
     Identifier = "]] .. identifier .. [[",
     Type = "ScreenSpaceImageLocal",
diff --git a/src/properties/propertyowner.cpp b/src/properties/propertyowner.cpp
index 4426580f8d..a434ac357a 100644
--- a/src/properties/propertyowner.cpp
+++ b/src/properties/propertyowner.cpp
@@ -399,11 +399,11 @@ void PropertyOwner::removePropertySubOwner(openspace::properties::PropertyOwner&
 void PropertyOwner::setIdentifier(std::string identifier) {
     ghoul_precondition(
         _identifier.find_first_of("\t\n ") == std::string::npos,
-        "Identifier must contain any whitespaces"
+        "Identifier must not contain any whitespaces"
     );
     ghoul_precondition(
         _identifier.find_first_of('.') == std::string::npos,
-        "Identifier must contain any whitespaces"
+        "Identifier must not contain any dots"
     );
 
     _identifier = std::move(identifier);