diff --git a/src/internal/scratch3reader.cpp b/src/internal/scratch3reader.cpp
index 55f50d26..1a36531c 100644
--- a/src/internal/scratch3reader.cpp
+++ b/src/internal/scratch3reader.cpp
@@ -193,10 +193,6 @@ bool Scratch3Reader::load()
 
             // TODO: Add comments
 
-            // currentCostume
-            READER_STEP(step, "target -> currentCostume");
-            target->setCurrentCostume(jsonTarget["currentCostume"]);
-
             // costumes
             READER_STEP(step, "target -> costumes");
             auto costumes = jsonTarget["costumes"];
@@ -218,6 +214,10 @@ bool Scratch3Reader::load()
                 target->addCostume(costume);
             }
 
+            // currentCostume
+            READER_STEP(step, "target -> currentCostume");
+            target->setCurrentCostume(jsonToValue(jsonTarget["currentCostume"]).toInt() + 1);
+
             // sounds
             READER_STEP(step, "target -> sounds");
             auto sounds = jsonTarget["sounds"];
diff --git a/src/scratch/target.cpp b/src/scratch/target.cpp
index ff2ddc14..ad0168e3 100644
--- a/src/scratch/target.cpp
+++ b/src/scratch/target.cpp
@@ -203,7 +203,8 @@ int Target::currentCostume() const
 /*! Sets the ID of the current costume. */
 void Target::setCurrentCostume(int newCostume)
 {
-    impl->currentCostume = newCostume;
+    if (newCostume > 0 && newCostume <= costumes().size())
+        impl->currentCostume = newCostume;
 }
 
 /*! Returns the list of costumes. */
diff --git a/src/scratch/target_p.h b/src/scratch/target_p.h
index 4ea13e05..da4126f2 100644
--- a/src/scratch/target_p.h
+++ b/src/scratch/target_p.h
@@ -26,7 +26,7 @@ struct TargetPrivate
         std::vector<std::shared_ptr<Variable>> variables;
         std::vector<std::shared_ptr<List>> lists;
         std::vector<std::shared_ptr<Block>> blocks;
-        int currentCostume = 1;
+        int currentCostume = 0;
         std::vector<std::shared_ptr<Costume>> costumes;
         std::vector<std::shared_ptr<Sound>> sounds;
         int layerOrder = 0;
diff --git a/test/load_project/load_project_test.cpp b/test/load_project/load_project_test.cpp
index de3d04c6..6dcdafdd 100644
--- a/test/load_project/load_project_test.cpp
+++ b/test/load_project/load_project_test.cpp
@@ -40,7 +40,7 @@ TEST(LoadProjectTest, EmptyProject)
         ASSERT_EQ(stage->blocks().size(), 0);
         ASSERT_EQ(stage->costumes().size(), 1);
         // TODO: Add comments
-        ASSERT_EQ(stage->currentCostume(), 0);
+        ASSERT_EQ(stage->currentCostume(), 1);
         ASSERT_EQ(stage->sounds().size(), 0);
         ASSERT_EQ(stage->layerOrder(), 0);
         ASSERT_EQ(stage->volume(), 100);
@@ -104,6 +104,7 @@ TEST(LoadProjectTest, LoadTestProject)
         ASSERT_EQ(sprite1->lists().size(), 1);
         ASSERT_EQ(sprite1->blocks().size(), 18);
         ASSERT_EQ(sprite1->costumes().size(), 2);
+        ASSERT_EQ(sprite1->currentCostume(), 2);
         ASSERT_EQ(sprite1->sounds().size(), 1);
         ASSERT_TRUE(sprite1->visible());
         ASSERT_EQ(sprite1->x(), 0);
diff --git a/test/scratch_classes/sprite_test.cpp b/test/scratch_classes/sprite_test.cpp
index e71b1f4d..60b9f468 100644
--- a/test/scratch_classes/sprite_test.cpp
+++ b/test/scratch_classes/sprite_test.cpp
@@ -44,6 +44,8 @@ TEST(SpriteTest, Clone)
     sprite.addList(list1);
     sprite.addList(list2);
 
+    sprite.addCostume(std::make_shared<Costume>("", "", ""));
+    sprite.addCostume(std::make_shared<Costume>("", "", ""));
     sprite.setCurrentCostume(2);
     sprite.setLayerOrder(5);
     sprite.setVolume(50);
diff --git a/test/scratch_classes/target_test.cpp b/test/scratch_classes/target_test.cpp
index 79790356..39730d98 100644
--- a/test/scratch_classes/target_test.cpp
+++ b/test/scratch_classes/target_test.cpp
@@ -178,9 +178,31 @@ TEST(TargetTest, Blocks)
 TEST(TargetTest, CurrentCostume)
 {
     Target target;
+    ASSERT_EQ(target.currentCostume(), 0);
+
+    target.setCurrentCostume(1);
+    ASSERT_EQ(target.currentCostume(), 0);
+
+    target.setCurrentCostume(2);
+    ASSERT_EQ(target.currentCostume(), 0);
+
+    target.addCostume(std::make_shared<Costume>("", "", ""));
+    ASSERT_EQ(target.currentCostume(), 0);
+
+    target.setCurrentCostume(1);
+    ASSERT_EQ(target.currentCostume(), 1);
+
+    target.setCurrentCostume(2);
+    ASSERT_EQ(target.currentCostume(), 1);
+
+    target.addCostume(std::make_shared<Costume>("", "", ""));
     ASSERT_EQ(target.currentCostume(), 1);
-    target.setCurrentCostume(5);
-    ASSERT_EQ(target.currentCostume(), 5);
+
+    target.setCurrentCostume(2);
+    ASSERT_EQ(target.currentCostume(), 2);
+
+    target.setCurrentCostume(3);
+    ASSERT_EQ(target.currentCostume(), 2);
 }
 
 TEST(TargetTest, Costumes)