diff --git a/libraries/fbx/src/GLTFSerializer.cpp b/libraries/fbx/src/GLTFSerializer.cpp
index c58d526ef1..8234f2b17d 100755
--- a/libraries/fbx/src/GLTFSerializer.cpp
+++ b/libraries/fbx/src/GLTFSerializer.cpp
@@ -1055,6 +1055,11 @@ bool GLTFSerializer::buildGeometry(HFMModel& hfmModel, const hifi::VariantHash&
 
                 int indicesAccessorIdx = primitive.indices;
 
+                if (indicesAccessorIdx > _file.accessors.size()) {
+                    qWarning(modelformat) << "Indices accessor index is out of bounds for model " << _url;
+                    continue;
+                }
+                
                 GLTFAccessor& indicesAccessor = _file.accessors[indicesAccessorIdx];
 
                 // Buffers
@@ -1093,6 +1098,11 @@ bool GLTFSerializer::buildGeometry(HFMModel& hfmModel, const hifi::VariantHash&
                 foreach(auto &key, keys) {
                     int accessorIdx = primitive.attributes.values[key];
 
+                    if (accessorIdx > _file.accessors.size()) {
+                        qWarning(modelformat) << "Accessor index is out of bounds for model " << _url;
+                        continue;
+                    }
+
                     GLTFAccessor& accessor = _file.accessors[accessorIdx];
 
                     if (key == "POSITION") {