diff --git a/base/precompilation.jl b/base/precompilation.jl
index 80648299b13fd..4f9b53e1c1ae8 100644
--- a/base/precompilation.jl
+++ b/base/precompilation.jl
@@ -171,7 +171,7 @@ function ExplicitEnv(envpath::String=Base.active_project())
     sizehint!(weakdeps_expanded, length(deps))
     sizehint!(extensions_expanded, length(deps))
 
-    if proj_name !== nothing
+    if proj_name !== nothing && proj_uuid !== nothing
         deps_expanded[proj_uuid] = filter!(!=(proj_uuid), collect(values(project_deps)))
         extensions_expanded[proj_uuid] = project_extensions
         path = get(project_d, "path", nothing)