diff --git a/src/Algorithm.cpp b/src/Algorithm.cpp
index 988a5b60..823891a6 100644
--- a/src/Algorithm.cpp
+++ b/src/Algorithm.cpp
@@ -9413,19 +9413,21 @@ void Algorithm::makeBlueprintInstantiationContext(const t_instanced_nfo& nfo, co
     }
     // parameters of non-parameterized ios (for pre-processor widthof/signed)
     Algorithm* alg = dynamic_cast<Algorithm*>(nfo.blueprint.raw());
-    for (auto io : nfo.blueprint->inputs()) {
-      if (io.type_nfo.base_type != Parameterized || !io.type_nfo.same_as.empty()) {
-        addToInstantiationContext(alg, io.name, io, _local_ictx, _local_ictx);
+    if (alg != nullptr) {
+      for (auto io : nfo.blueprint->inputs()) {
+        if (io.type_nfo.base_type != Parameterized || !io.type_nfo.same_as.empty()) {
+          addToInstantiationContext(alg, io.name, io, _local_ictx, _local_ictx);
+        }
       }
-    }
-    for (auto io : nfo.blueprint->outputs()) {
-      if (io.type_nfo.base_type != Parameterized || !io.type_nfo.same_as.empty()) {
-        addToInstantiationContext(alg, io.name, io, _local_ictx, _local_ictx);
+      for (auto io : nfo.blueprint->outputs()) {
+        if (io.type_nfo.base_type != Parameterized || !io.type_nfo.same_as.empty()) {
+          addToInstantiationContext(alg, io.name, io, _local_ictx, _local_ictx);
+        }
       }
-    }
-    for (auto io : nfo.blueprint->inOuts()) {
-      if (io.type_nfo.base_type != Parameterized || !io.type_nfo.same_as.empty()) {
-        addToInstantiationContext(alg, io.name, io, _local_ictx, _local_ictx);
+      for (auto io : nfo.blueprint->inOuts()) {
+        if (io.type_nfo.base_type != Parameterized || !io.type_nfo.same_as.empty()) {
+          addToInstantiationContext(alg, io.name, io, _local_ictx, _local_ictx);
+        }
       }
     }
   }