diff --git a/modules/contrib/src/ba.cpp b/modules/contrib/src/ba.cpp
index d4425bfc40..c8679aa175 100644
--- a/modules/contrib/src/ba.cpp
+++ b/modules/contrib/src/ba.cpp
@@ -48,6 +48,8 @@ LevMarqSparse::LevMarqSparse()
 {
     A = B = W = Vis_index = X = prevP = P = deltaP = err = JtJ_diag = S = hX = NULL;
     U = ea = V = inv_V_star = eb = Yj = NULL;    
+    num_points = 0;
+    num_cams = 0;
 }
 
 LevMarqSparse::~LevMarqSparse()