diff --git a/common/footprint_info.cpp b/common/footprint_info.cpp
index ce31cf5e1c..dd6be254bd 100644
--- a/common/footprint_info.cpp
+++ b/common/footprint_info.cpp
@@ -141,6 +141,8 @@ std::unique_ptr<FOOTPRINT_LIST> FOOTPRINT_LIST::GetInstance( KIWAY& aKiway )
 
 FOOTPRINT_ASYNC_LOADER::FOOTPRINT_ASYNC_LOADER() : m_list( nullptr )
 {
+    m_started = false;
+    m_total_libs = 0;
 }
 
 
diff --git a/common/widgets/footprint_select_widget.cpp b/common/widgets/footprint_select_widget.cpp
index d3b8375f64..8af66c6214 100644
--- a/common/widgets/footprint_select_widget.cpp
+++ b/common/widgets/footprint_select_widget.cpp
@@ -72,6 +72,7 @@ FOOTPRINT_SELECT_WIDGET::FOOTPRINT_SELECT_WIDGET( wxWindow* aParent,
           m_fp_loader( aLoader ),
           m_fp_list( aFpList )
 {
+    m_zero_filter = true;
     m_sizer = new wxBoxSizer( wxVERTICAL );
     m_progress_timer = std::make_unique<wxTimer>( this );
     m_book = new wxSimplebook( this, wxID_ANY );
diff --git a/include/geometry/poly_grid_partition.h b/include/geometry/poly_grid_partition.h
index dba932d0bb..75ed0c42e8 100644
--- a/include/geometry/poly_grid_partition.h
+++ b/include/geometry/poly_grid_partition.h
@@ -281,6 +281,7 @@ private:
     {
         SCAN_STATE()
         {
+            dist_prev   = INT_MAX;
             dist_max    = INT_MAX;
             nearest     = -1;
             nearest_prev = -1;
diff --git a/pcbnew/footprint_preview_panel.cpp b/pcbnew/footprint_preview_panel.cpp
index 6bb4b6cf23..3165eb6d0f 100644
--- a/pcbnew/footprint_preview_panel.cpp
+++ b/pcbnew/footprint_preview_panel.cpp
@@ -165,7 +165,7 @@ class FP_THREAD_IFACE
         std::deque<CACHE_ENTRY> m_loaderQueue;
         std::map<LIB_ID, CACHE_ENTRY> m_cachedFootprints;
         LIB_ID m_current_fp;
-        FOOTPRINT_PREVIEW_PANEL* m_panel;
+        FOOTPRINT_PREVIEW_PANEL* m_panel = nullptr;
         MUTEX m_lock;
 };