diff --git a/gpt4all-backend/gptj.cpp b/gpt4all-backend/gptj.cpp
index 6cb81161..0aacd854 100644
--- a/gpt4all-backend/gptj.cpp
+++ b/gpt4all-backend/gptj.cpp
@@ -833,6 +833,7 @@ struct GPTJPrivate {
 GPTJ::GPTJ()
     : d_ptr(new GPTJPrivate) {
     d_ptr->model = new gptj_model;
+    d_ptr->model->ctx = nullptr;
     d_ptr->modelLoaded = false;
 }
 
diff --git a/gpt4all-backend/mpt.cpp b/gpt4all-backend/mpt.cpp
index dea12965..8c3cebf1 100644
--- a/gpt4all-backend/mpt.cpp
+++ b/gpt4all-backend/mpt.cpp
@@ -757,6 +757,7 @@ struct MPTPrivate {
 MPT::MPT()
     : d_ptr(new MPTPrivate) {
     d_ptr->model = new mpt_model;
+    d_ptr->model->ctx = nullptr;
     d_ptr->modelLoaded = false;
 }
 
diff --git a/gpt4all-backend/replit.cpp b/gpt4all-backend/replit.cpp
index 568b6441..d4425ff0 100644
--- a/gpt4all-backend/replit.cpp
+++ b/gpt4all-backend/replit.cpp
@@ -884,6 +884,7 @@ Replit::Replit()
     : d_ptr(new ReplitPrivate) {
 
     d_ptr->model = new replit_model;
+    d_ptr->model->ctx = nullptr;
     d_ptr->modelLoaded = false;
 }