diff --git a/lld/wasm/MapFile.cpp b/lld/wasm/MapFile.cpp
--- a/lld/wasm/MapFile.cpp
+++ b/lld/wasm/MapFile.cpp
@@ -76,8 +76,11 @@
   std::vector<std::string> str(syms.size());
   parallelForEachN(0, syms.size(), [&](size_t i) {
     raw_string_ostream os(str[i]);
-    auto &chunk = *syms[i]->getChunk();
-    uint64_t fileOffset = chunk.outputSec->getOffset() + chunk.outputOffset;
+    auto *chunk = syms[i]->getChunk();
+    // TODO: Handle symbol types besides DefinedFunction and DefinedData
+    if (!chunk)
+      return;
+    uint64_t fileOffset = chunk->outputSec->getOffset() + chunk->outputOffset;
     uint64_t vma = -1;
     uint64_t size = 0;
     if (auto *DD = dyn_cast<DefinedData>(syms[i])) {