diff --git a/src/loaders/blend_format.nim b/src/loaders/blend_format.nim
index 9e9576e..14a31ef 100644
--- a/src/loaders/blend_format.nim
+++ b/src/loaders/blend_format.nim
@@ -122,7 +122,7 @@ proc hash*(n: FNode): Hash =
 
 const BASIC_TYPE_LENGTHS = [1, 1, 2, 2, 4, 4, 4, 4, 8, 8, 8, 0, 1]
 
-template `[]`*(blocks: NamedBlocks, s: string): untyped = blocks[[s[0],s[1]]]
+template `[]`*(blocks: NamedBlocks, s: string): untyped = blocks.getOrDefault([s[0],s[1]])
 # iterator items*(s: NamedBlocks): seq[FNode] {.borrow.}
 # iterator pairs*(s: NamedBlocks): (array[2, char], seq[FNode]) {.borrow.}